English words: opiate to opposite side

300 English words, part 30 of 67 of the words starting with O, A to Z. 24 have a page of their own.

English words opiate to opposite side

opiate adjective, noun, verb /ˈəʊpi.ət/: Relating to, resembling, or containing opium.
opiated adjective, verb: Treated with an opiate.
opiatelike adjective: Resembling or characteristic of an opiate.
opiatergic adjective: Alternative form of opioidergic.
opiatic adjective: Of or relating to opiates.
opicapone noun: A drug for the treatment of Parkinson's disease.
opie noun: Short for opilio crab.
opiferous adjective: Bringing help; helpful.
opifice noun /ˈəʊpɪfɪs/: workmanship
opificer noun: A person who creates or makes something.
opihi noun: A limpet of genus Cellana.
opiine noun: A braconid wasp of the subfamily Opiinae
opiism noun: Alternative form of opiumism
opiliaceous adjective: Of or relating to the Opiliaceae.
opilio noun: The snow crab Chionoecetes opilio.
opilio crab noun: Any member of the species Chionoecetes opilio of snow crabs native to shelf depths in the northwest Atlantic Ocean and north Pacific Ocean.
opilioacarid noun: Any mite in the family Opilioacaridae.
opilionid noun: Any of the harvestmen/daddy longlegs in the order Opiliones.
opilionologist noun: One who studies the Opiliones or harvestmen.
opilionology noun: The study of the Opiliones or harvestmen.
OPIM noun: Initialism of other potentially infected material.
opime adjective /əˈpaɪm/: magnificent, rich, plenteous
Opimian adjective: Of or relating to the famous Roman vintage of 121 BC.
opinability noun: The quality of being opinable.
opinable adjective: Capable of being opined or thought.
opinant noun: One who offers an opinion.
opination noun: The state or process of opining.
opinative adjective /ˈɒpɪnətɪv/: Conjectural; expressing an opinion rather than a fact.
opinatively adverb: In an opinative manner.
opinator noun /ˈɒpɪneɪtə(ɹ)/: An opinionated person, or someone who holds an opinion.
opine noun, verb /ə(ʊ)ˈpaɪn/: To express an opinion; to state as an opinion; to suppose, consider (that).
opiner noun: One who opines.
opiniaster noun: An opinionated person.
opiniastrety noun: Stubbornness; obstinacy.
opiniastrous adjective: opinionated
opiniate verb /əˈpɪnieɪt/: To hold an opinion, especially in a persistent manner.
opiniativeness noun: The quality of being opiniative.
opiniator noun: Someone who is opinionated.
opiniatrety noun: opinionatedness
opinicus noun: A heraldic imaginary creature with an eagle's head, a short tail, and sometimes wings.
opining noun, verb: The act of giving one's opinion.
opinio juris sive necessitatis phrase: The principle of international law where states believe or accept that a practice exists and must be followed because of a rule of law requiring it, to the...
opinion noun, verb /əˈpɪn.jən/: A belief, judgment or perspective that a person has formed, either through objective or subjective reasoning, about a topic, issue, person or thing.
opinion bash verb: The act of disrespecting or insulting another person's opinion.
opinion former noun: Synonym of opinionmaker.
opinion host noun: Host of an opinion show.
opinion leader noun: One who guides and influences public opinion.
opinion maker noun: Alternative form of opinionmaker.
opinion piece noun: An article in which the author expresses their personal opinion on a given subject.
opinion poll noun: A poll organized in an attempt to quantify public opinion on a subject.
opinion privilege noun: The right to freely express one's opinion in public, without it being subjected to restrictions.
opinion show noun: A program that offers news heavily mixed with opinion-based commentary.
opinionable adjective: Being a matter of opinion; not positively settled.
opinionaire noun: opinion poll
opinional adjective: Based on or constituting an opinion.
opinionate adjective, verb /əˈpɪnjəneɪt/: To have or express as an opinion; to opine.
opinionated adjective, verb /əˈpɪn.jə.neɪ.tɪd/: Having very strong opinions.
opinionatedly adverb: In an opinionated manner.
opinionatedness noun: The state or condition of being opinionated.
opinionately adverb: In a conceited manner.
opinionation noun: The quality of being opinionated.
opinionative adjective: Of, pertaining to, being, or expressing opinion.
opinionatively adverb: In an opinionative manner.
opinionativeness noun: Quality of being opinionative.
opinionator noun: An opinionated person; one given to conjecture.
opinioned adjective, verb /əˈpɪnjənd/: Having a specified kind of opinion.
opinionist noun: One fond of his own notions, or unduly attached to his own opinions.
opinionize verb: To express one's opinion in a strong or assertive manner.
opinionizer noun: One who opinionizes.
opinionless adjective: Without an opinion or opinions.
opinionlessness noun: Absence of opinions.
opinionmaker noun: One who influences the public in their opinions.
opinionmaking noun: The process of influencing the public in their opinions.
opinionnaire noun: A form containing a list of statements, each of which the members of a selected group are asked to endorse or reject; the purpose being to gather...
opio- prefix: Opioid.
opioid noun /ˈəʊpiɔɪd/: Any of the natural substances, such as an endorphin, released in the body in response to pain; an endogenous opioid.
opioidergic adjective: Operating on the opioid system in the body or brain.
opioidlike adjective: Resembling or characteristic of opioids.
opioidophobia noun: The aversion to prescribing, administering or taking opioid medications for fear of addiction.
opiomania noun: Opium addiction.
opiomaniac noun: An opium addict.
opiomelanocortin noun: A polypeptide, found in the pituitary gland, associated with endorphins and other hormones
opiophagism noun: The oral consumption of opium.
opiophile noun: A person who enjoys taking opium.
opiophilia noun: An inclination toward prescribing opiates.
opiophobe noun: One who fears or hates the drug opium.
opiophobia noun: An aversion to prescribing opiates.
opiophobic adjective: Of, relating to, or affected by opiophobia–the aversion to prescribing or administering opiates for analgesia.
opiorphin noun: A painkilling chemical compound first isolated from human saliva.
opiparous adjective: Sumptuous, luxurious.
opipramol noun /əʊˈpɪpɹəmɒl/: A psychoactive drug used as an anxiolytic and antidepressant.
OPIs noun, prefix: Alternative form of opistho-.
opisometer noun /ɒpɪˈsɒmɪtə(ɹ)/: A device for measuring the length of curved lines, such as on a map.
opist- prefix: Alternative form of opistho-.
opisth- prefix: Alternative form of opistho-.
opisthaptor noun: A haptor on the posterior of a trematode.
opisthenar noun: The back of the hand.
opisthion noun: The middle of the posterior margin of the foramen magnum of the skull.
opistho- prefix: in the back, behind, rear, posterior
opisthobranch adjective, noun /ɵˈpɪsθəbɹæŋk/: A gastropod with gills behind the heart, formerly thought to belong to a single group.
opisthobranchiate adjective, noun: Of or pertaining to the Opisthobranchia.
opisthobranchism noun: The property of being an opisthobranch.
opisthocline adjective, noun: leaning backwards
opisthocoelian adjective: opisthocoelous
opisthocoelous adjective: concave behind; applied especially to vertebrae in which the anterior end of the centrum is convex and the posterior concave
opisthocoely noun: The condition of being opisthocoelous
opisthocomid noun: Any bird of the family Opisthocomidae, which comprises the hoazin and extinct relatives.
opisthocomiform noun: Any bird of the order Opisthocomiformes
opisthocomine adjective: Of or pertaining to birds of the family Opisthocomidae, which is represented by the sole extant genus Opisthocomus and species Opisthocomus hoazin (hoazin).
opisthocranion noun: The posteriormost point in the midsagittal plane of the occiput
opisthodelphic adjective: Having parallel uteri that are directed to the rear
opisthodome noun: Alternative spelling of opisthodomos.
opisthodomos noun: A porch at the rear of a temple, set against the blank back wall of the cella.
opisthodont adjective, noun: Having back teeth only.
opisthodontian noun: Any moth of the genus Opisthodontia
opisthogastric adjective: behind the stomach
opisthoglyph noun: Any opisthoglyphous snake.
opisthoglyphous adjective: Whose teeth include an enlarged pair at the back of the maxillae which normally angle backwards and are grooved to channel venom into the puncture.
opisthognathid noun: Any in the family Opistognathidae of jawfishes.
opisthognathous adjective: Having retreating jaws or teeth.
opisthograph noun: Any early document (such as a roll of papyrus) that has writing on the back as well as the front.
opisthographic adjective: Written on both sides.
opisthography noun: A writing upon the back of anything, as upon the back of a sheet already written upon on one side.
opisthogyrate adjective: That curves toward the posterior
opisthokont noun /ɒˈpɪsθəʊ̆kɒnt/: Any of very many eukaryotes, including animals and fungi, whose flagellate cells (if any) propel themselves with a single posterior flagellum.
opisthomastigote noun: A stage in unicellular life-cycle, typically trypanosomes, where the flagellum is posterior of the nucleus, and passes through a groove in the cell body.
opisthomerite noun: The posterior gonopods of a millipede of the infraclass Helminthomorpha
opisthomonorchiine adjective: Of or relating to the monorchiids of genus Opisthomonorchis
opisthonotal adjective: opisthosomal and dorsal
opisthoparian adjective, noun: Any trilobite of the order †Opisthoparia.
opisthoproctid noun: Any fish in the family Opisthoproctidae; a barreleye.
opisthopubic adjective: Having the pubis bones pointing backward, as in some dinosaurs.
opisthorchiasis noun /ˌɒpɪsθɔːˈkaɪəsɪs/: A parasitic disease caused by trematodes in the genus Opisthorchis.
opisthorchiatic adjective: Relating to opisthorchiasis.
opisthorchid noun: Any fluke of the family Opisthorchiidae.
opisthorchidal adjective: Relating to the opisthorchids
opisthorchiid noun: Any trematode flatworm in the family Opisthorchiidae.
opisthorhynchous adjective: Having the beak directed backwards.
opisthosoma noun: The posterior segment of the two-part body structure of chelicerates. Often used interchangeably with abdomen.
opisthosomal adjective: Relating to the opisthosoma.
opisthosomatic adjective: Alternative form of opisthosomal.
opisthosphendone noun: A plain or ornamented band of fabric, broad in the middle and narrow at the ends, and fastened in the front, used in Ancient Greece to support the hair...
opisthoteuthid noun: Any octopus in the family Opisthoteuthidae.
opisthothele noun: Any spider of the suborder Opisthothelae.
opisthothoracic adjective: Relating to an opisthothorax.
opisthothorax noun: The portion of the thorax behind the prothorax.
opisthotic noun: The inferior and posterior of the three elements forming the periotic bone. It is found in crocodiles and dinosaurs, among other species.
opisthotonic adjective: Relating to opisthotonus.
opisthotonos noun: Sustained tetanic spasm in which the body is bent backwards and stiffened, as produced by various diseases.
opisthotonus noun: Alternative form of opisthotonos.
opistognathid noun: Alternative spelling of opisthognathid.
opistoporin noun: Any of a group of peptides that form pores in cell membranes
opistothorax noun: A wormlike segmented extension to the thorax.
opitulation noun /oʊˌpɪt͡ʃ(j)əˈleɪʃən/: The act of helping or aiding; assistance.
Opitz G/BBB syndrome noun: A rare genetic disorder affecting physical structures along the midline of the body.
Opitz-Kaveggia syndrome noun: FG syndrome
Opitz syndrome noun: Synonym of Opitz G/BBB syndrome.
opium noun /ˈoʊ.pi.əm/: A yellow-brown, addictive narcotic drug obtained from the dried juice of unripe pods of the opium poppy, Papaver somniferum, and containing alkaloids such...
opium alkaloid noun: Synonym of morphine alkaloid.
opium den noun: An establishment in which opium was sold and smoked.
opium-eater noun: A person who uses opium as a recreational drug; an opium addict.
opium-eating adjective: That uses opium as a recreational drug.
opium lamp noun: An oil lamp with a funnel, designed to facilitate the vaporization and inhalation of opium.
opium of the people phrase: Used to describe religion and compare it to opium.
opium pillow noun: A hard ceramic or wooden bed pillow, used in opium dens, into which the opium smoker would place their valuables as they sleep for safekeeping.
opium pipe noun: Any handheld pipe for smoking opium.
opium poppy noun: Papaver somniferum, the species of plant from which opium and poppy seeds are extracted.
opiumism noun: Opium addiction.
opiumist noun: One who is addicted to opium.
opiumlike adjective: Resembling or characteristic of opium.
oplan noun /ˈɒplæn/: operational plan
oplatek noun: A traditional Polish unleavened wafer baked from pure wheat flour and water, usually rectangular in shape and very thin, embossed with Christmas-related...
oplax adjective: Pertaining to the dual of a lax monoidal functor.
ople tree noun: The witch hazel.
oplegnathid noun: Any fish in the family Oplegnathidae.
Opler proper noun: A surname.
opless adjective: Without ops (channel operators).
OPLL noun: Initialism of ossification of the posterior longitudinal ligament.
oplock noun: An opportunistic lock on a file system object, used for caching purposes rather than to avoid modifications by multiple users at once.
oplophorid noun: Any shrimp in the family Oplophoridae.
oplurid noun: Any lizard in the family Opluridae.
OPM noun: Initialism of other people's money.
opmask noun: A bit mask used to select elements in vector processing.
OPMN noun: Abbreviation of Oracle Process Management and Notification.
opmonoidal adjective: Having a natural family of distributive morphisms and an identity morphism that are coherent.
OPN noun: Initialism of omnipause neuron.
opng. noun: Abbreviation of opening.
opo noun: The calabash or bottle gourd.
opo squash noun: calabash, Lagenaria spp., especially Lagenaria siceraria.
opobalsam noun: The aromatic resinous juice of Commiphora opobalsamum (balm of Gilead).
opobalsamum noun: Synonym of opobalsam.
OPOC adjective, noun: Abbreviation of opposed cylinder.
opodeldoc noun /ˌɒpəˈdɛldɒk/: A kind of plaster, said to have been invented by Mindererus, used for external injuries.
Opoku proper noun: A surname from Akan.
Opole proper noun: The capital and largest city of Opole Voivodeship, in the Silesia region of southern Poland.
-opoly suffix: Alternative form of -poly.
opomyzid noun: Any fly of the family Opomyzidae.
opopanax noun /əˈpɒpənaks/: A gum resin obtained from the root of Opopanax chironium, formerly used in medicine.
opoponax noun: Alternative form of opopanax.
opopponax noun: Alternative form of opopanax.
oporice noun: A medicine prepared from quinces, pomegranates, etc.
oporopolist noun: A seller of fruit.
Oporto proper noun /əˈpɔː(ɹ)təʊ/: Synonym of Porto (“city in Portugal”).
oportuzumab monatox noun: A monoclonal antibody used as an antineoplastic.
opossum noun /əˈpɒsəm/: Any American marsupial of the family Didelphidae in the order Didelphimorphia.
opossum rat noun: Rattus marmosurus, a rodent found in Indonesia.
opossum shrimp noun: Any shrimp of the order Mysida, known for having pouches for protecting their young.
opossum wood noun: A silver bell tree (Halesia spp.)
opostegid noun: Any moth in the family Opostegidae.
opotherapeutic adjective: of or relating to opotherapy
opotherapy noun: organotherapy
Opotiki proper noun: A town and local government district in the Bay of Plenty, New Zealand.
opp adjective, noun, preposition /ɒp/: Initialism of other people's problems.
oppa noun /ˈɒpə/: An affectionate term of address for an older brother or somewhat older man.
oppah noun: Alternative form of oppa.
oppai noun: A woman's breasts, particularly of an anime or manga character.
oppai loli noun: A character in fiction with the frame of a loli but with a disproportionately large chest.
oppari noun: An impromptu folk song of southern India, traditionally sung by women during a death ceremony in order to memorialize the person who has died.
Oppel proper noun: A surname from German.
Oppel-Kundt illusion noun: An optical illusion that occurs when comparing the sizes of filled and unfilled parts of an image.
oppeliid noun: Any member of the Oppeliidae.
Oppen proper noun: A surname.
Oppenauer oxidation noun: A method for selectively oxidizing secondary alcohols to ketones.
Oppenesque adjective: Resembling or characteristic of American poet George Oppen (1908–1984).
Oppenheim proper noun: A surname from German.
Oppenheimer noun /ˈɒpənˌhaɪmər/: A denizen of Oppenheim.
Oppenheimerian adjective: Of or relating to Franz Oppenheimer (1864–1943), German Jewish sociologist and political economist.
oppenheimerite noun: A triclinic mineral that is a mixed hydrated sodium sulfate and uranate
opperca noun: copper.
Oppianic adjective: Of or relating to the 2nd-century Greco-Roman poet Oppian.
oppidan adjective, noun: Of or pertaining to a town or conurbation.
oppidum noun: A large, defended Iron Age settlement associated with the Celtic La Tène culture.
oppigneration noun: Alternative form of oppignoration.
oppignorate verb: To pawn; to lay in pledge.
oppignoration noun: The act of pawning or laying in pledge.
oppilate adjective, verb /ˈɑː.pə.leɪt/: To block, to stop up, to obstruct.
oppilation noun /ɒpɪˈleɪʃən/: a stopping by redundant matter, i.e. an obstruction in organs, particularly in the lower intestines.
oppilative adjective, noun: Obstructive.
opping noun, verb: The promotion of an IRC user to operator status.
Oppland proper noun: A former county in eastern Norway.
opplete adjective: full; crowded
oppletion noun: The act of filling up.
oppo noun /ˈɒ.pəʊ/: A friend, associate or colleague.
oppo research noun: Research into one's opponent's family, friends, and past, which aims to uncover activities or interests which embarrass or discredit them.
oppo taco noun /ˌɑpoʊ ˈtɑkoʊ/: A home run where the ball is hit to the opposite side of the baseball field to where one stands when swinging the bat.
oppone verb /əˈpəʊn/: To oppose.
opponency noun: The act of opening an academic disputation; the proposition of objections to a tenet, as an exercise for a degree.
opponens noun: Short for opponens digiti minimi (“a muscle of the hand”).
opponent adjective, noun /əˈpəʊ.nənt/: One who opposes another; one who works or takes a position against someone or something; one who attempts to stop the progress of someone or something.
opportunate adjective: Synonym of opportune.
opportune adjective /ɒ.pəˈt͡ʃ(j)uːn/: Suitable for some particular purpose.
opportuneless adjective: Devoid of opportunity.
opportunely adverb /ˈɒp.ə.tjuːn.li/: In a manner suitable for some particular purpose.
opportuneness noun: The state or condition of being opportune.
opportuning adjective: opportunistic
opportunism noun: The practice of taking advantage of any situations or people to achieve an end, often with no regard for principles or consequences.
opportunist noun /ˌɒpə(ɹ)ˈtjuːnɪst/: Someone who takes advantage of any opportunity to advance their own situation, placing expediency above principle.
opportunistic adjective /ˌɒp.əˌtjuːˈnɪs.tɪk/: Taking advantage of situations that arise.
opportunistic infection noun: Any infection that causes disease and occurs only when the host's immune system is impaired.
opportunistic necrophiliac adjective: One of the ten classifications of necrophilia based on the increasing severity of the disorder as defined by the American forensic psychologist Anil...
opportunistically adverb: In an opportunistic manner.
opportunitroph noun: An opportunistic feeder
opportunity noun /ˌɒp.əˈtjuː.nɪ.tɪ/: A chance for advancement, progress or profit.
opportunity class noun: A separate primary-school class for teaching gifted children.
opportunity comes knocking phrase: Synonym of opportunity knocks.
opportunity cost noun: The cost of an opportunity forgone (and the loss of the benefits that could be received from that opportunity); the most valuable forgone alternative.
opportunity knocks phrase: An opportunity arises.
opportunity knocks at every man's door proverb: Everybody gets opportunities.
opportunity makes a thief proverb: Alternative form of opportunity makes the thief.
opportunity makes the thief proverb: People are more likely to steal something if presented with a convenient opportunity to do so.
opportunity room noun: Synonym of opportunity class (“a separate class for teaching backward children”).
opportunity seldom knocks twice proverb: Opportune times seldom appear again.
opportunity servicing noun: The practice of servicing equipment when it is convenient to do so, rather than on a fixed schedule.
opportunity shop noun: An op shop.
opportunity window noun: Alternative form of window of opportunity.
opportunityless adjective: Devoid of opportunity.
opportunivore noun: A person who subsists on still-edible food that has been or was going to be discarded.
opposability noun: The condition or quality of being opposable (capable of being placed opposite to something else).
opposable adjective: Susceptible to being opposed or resisted.
opposable thumb noun: A thumb that can be positioned so that it faces the opposite direction from that of the other fingers, especially the smallest finger, of the same hand.
opposably adverb: in an opposable manner
opposal noun: opposition
oppose verb /əˈpəʊz/: To attempt to stop the progression of; to resist or antagonize by physical means, or by arguments, etc.; to contend against.
opposed adjective, verb /əˈpoʊzd/: Acting in opposition; opposing.
opposed cylinder noun: A type of engine cylinder, with two pistons, horizontally opposed with each other, and the combustion chamber sitting centrally between the two pistons.
opposed piston opposed cylinder adjective: Pertaining to the opposed-piston engine / opposed-cylinder engine
opposedly adverb: In an opposed manner.
opposedness noun: Quality of being opposed.
opposee noun: One against whom there is opposition; the opposed party.
opposeless adjective: Not to be effectually opposed; irresistible.
opposer noun: One who opposes, one who shows opposition.
opposide noun: A particular steroid glycoside.
opposing adjective, verb: That opposes or oppose; on the opposite side.
opposingly adverb: in a manner that opposes
opposit verb: to posit or assume as a contradictory; negative or deny
opposite adjective, adverb, noun, preposition /ˈɒp.ə.zɪt/: Located directly across from something else, or from each other.
opposite angle noun: Either of the angles directly opposite to each other when two lines intersect in a plane.
opposite number noun: A person who holds a position in an organization, sports team, or the like, that corresponds to that held by another person in another organization; a...
opposite sex noun: Women in relation to men or men in relation to women.
opposite side noun: A side, party (e.g. a team or armed force) seen as adversary, enemy etc. opposite one (or more) other(s), as in a battle or team sports competition.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0): each word's first meaning. A word with a page of its own links to it; for the rest, this line is PlainSpell's entry. Total under O: 20,049 words, in 67 parts.