English words: operantly to opianyl

300 English words, part 29 of 67 of the words starting with O, A to Z. 26 have a page of their own.

English words operantly to opianyl

operantly adverb: In an operant manner
operaphile noun: One who enthusiastically enjoys opera.
operaphobe noun: A person who hates opera.
operatable adjective /ˈɒpəɹeɪtəbl/: Alternative form of operable.
operate verb /ˈɒpəɹeɪt/: To perform a work or labour; to exert power or strength, physical or mechanical; to act.
operated adjective, verb /ˈɑpəɹeɪtɪd/: Operated by the means specified e.g. a battery-operated toy.
operatee noun: Someone who has an operation.
operatic adjective /ˌɒp.əˈɹæt.ɪk/: Of, related to, or typical of opera.
operatic soprano noun: The highest female singing voice.
operatical adjective: Alternative form of operatic.
operatically adverb: In an operatic manner.
operatics noun: exaggerated or overly emotional behaviour; histrionics
operatin' verb: Pronunciation spelling of operating.
operating adjective, noun, verb /ˈɑpəɹeɪtɪŋ/: In operation; that operates.
operating concept noun: A description, usually graphical, showing the major participants or components in a system and their interrelationships.
operating cost noun: Expense which is related to the operation of a business.
operating cycle noun: The business cycle from startup of operations to the profit; from obtaining the raw material, through designing and production, to the distribution and profits.
operating depth noun: The maximum depth at which a submarine is permitted to operate when actively engaged in battle.
operating expenditure noun: Synonym of operating expense.
operating expense noun: An ongoing cost for running a product, business, or system.
operating income noun: Income from doing business (as opposed to unearned income such as interest) with operating expenses subtracted, but before taxes have been subtracted.
operating leverage noun: Synonym of leverage (“the ability to earn very high returns when operating at high-capacity utilization of a facility”)
operating loss noun: Negative operating income.
operating room noun: A room in a hospital used for performing surgical operations.
operating room table noun: An operating table.
operating system noun /ˈɒpəˌɹeɪtɪŋ ˌsɪstəm/: Software that is designed for controlling the allocation and the use of various hardware resources to tasks and remote terminals.
operating table noun: A table on which a patient lies during a surgical operation.
operating theatre noun: A room in a hospital used for performing surgery (originally designed for operations in front of observers).
operating time noun: The time interval between the instant of the occurrence of a specified input condition to a system and the instant of completion of a specified operation.
operation noun /ˌɒp.əˈɹeɪ.ʃən/: The method by which a device performs its function.
operation of law noun: An application of a legal rule that automatically brings about a legal consequence.
operational adjective /ˌɒp.əˈɹeɪ.ʃə.nəl/: Of or relating to operations, especially military operations.
operational analysis noun: operations research
operational calculus noun: The study of calculus from the perspective of the theory of operators.
operational definition noun: A showing of something – such as a variable, term, or object – in terms of the specific process or set of validation tests used to determine its presence...
operational encirclement noun: a situation of (partial) encirclement where the besieged forces are not yet in imminent danger of destruction or capture, but are unable to organize...
operational exhaustion noun: The acute psychological trauma experienced in combat environments which can lead to combat fatigue.
operational fatigue noun: Synonym of combat fatigue.
operational research noun: Alternative form of operations research.
operational service period noun: A period during which a telecommunications service remains in an operational state.
operational taxonomic unit noun: A terminal node in phylogenetic analysis; an organism.
operationalisability noun: Alternative spelling of operationalizability.
operationalisable adjective: Alternative spelling of operationalizable.
operationalisation noun: Alternative spelling of operationalization.
operationalise verb: Alternative spelling of operationalize.
operationalism noun: A philosophy that attempts to define all scientific concepts in terms of specified operations or procedures of observation and measurement.
operationalist noun: A proponent of operationalism.
operationalistic adjective: Of or pertaining to operationalism.
operationality noun: The characteristic of being operational.
operationalizability noun: The state or characteristic of being capable of being operationalized.
operationalizable adjective: Possible to operationalize; subject to operationalization.
operationalization noun: The act or process of operationalizing.
operationalize verb /ɒpəˈɹeɪʃ(ə)nəlʌɪz/: To make operational.
operationally adverb: In an operational manner; in accordance with an operation.
operationism noun: The doctrine that the meaning of a term consists of the operation(s) performed in defining it
operationist noun: A proponent of operationism.
operationistic adjective: Of or relating to operationism.
operations noun /ˌɒp.əˈɹeɪ.ʃənz/: Any practically minded combination of business administration, management science, operations research, systems engineering, and industrial engineering.
operations manager noun: A manager who is responsible for the efficiency of business operations, including overseeing training, pay scales, and ensuring that work is performed...
operations research noun: The application of scientific methods and techniques to problems of decision making, especially in business management and government administration.
operatise verb: Alternative form of operatize.
operatist noun: A composer of opera.
operative adjective, noun /ˈɒpəɹətɪv/: Effectual or important.
operative clause noun: A clause (of a judgment, order, resolution, etc.) which requires anything to be done or not to be done.
operative word noun: The key word in a sentence.
operatively adverb: In an operative manner.
operativeness noun: The state or quality of being operative.
operativity noun: operativeness
operatize verb: To convert into operatic form.
operator noun /ˈɒpəˌɹeɪtə/: A person or organisation that operates a device, system, service, etc.
operator theory noun: A branch of functional analysis, being the study of linear operators on function spaces.
operatorial adjective: Of or pertaining to an operator
operatorless adjective: Without an operator (person who operates); fully automatic.
operatorship noun: The office of an operator
operatory adjective, noun: effective; practical; operative
operatress noun: A female operator.
operatrix noun: A female operator.
opercle noun: An operculum.
opercled adjective: Having an opercle.
opercular adjective, noun: relating to the operculum
opercularisation noun: Alternative form of opercularization.
opercularization noun: The formation and development of the operculum
opercularly adverb: In opercular fashion.
operculate adjective, noun, verb: Having an operculum.
operculated adjective: operculate
operculation noun: The condition of being operculate
opercule noun: Alternative form of operculum.
operculectomy noun: The surgical procedure of removing the operculum.
operculiferous adjective: Bearing an operculum.
operculiform adjective: Having the form of a lid or cover.
operculigenous adjective: Producing an operculum.
operculigerous adjective: Having an operculum.
operculitis noun: Inflammation (pericoronitis) of the operculum.
operculoinsular adjective: opercular and insular
operculopremotor adjective: opercular and premotor
operculum noun /əʊˈpɜː.kjʊ.ləm/: A covering flap in animals and insects, such as a gill cover or the lid of nits.
opere citato adverb /ˈɒpɛɹeɪ sɪˈtɑːtəʊ/: In the work (already) cited or quoted. Used, typically in footnotes and endnotes, to cite in an abbreviated form a source that has been cited previously;...
operetta noun /ɒpəˈɹɛtə/: A lighter version of opera with a frivolous story and spoken dialogue.
operetta house noun /ˌɒp.əˈɹɛt.ə ˌhaʊ̯s/: A theatre, or similar building, primarily used for staging operetta.
operette noun: Alternative form of operetta (“light opera”).
operettic adjective: of or relating to an operetta
operettist noun: The composer of an operetta.
operibus citatis adverb /ɒˈpɛɹɪbəs sɪˈtɑːtiːz/: In the works (already) cited or quoted.
operidine noun: The opioid analgesic drug pethidine.
operon noun: A unit of genetic material that functions in a coordinated manner by means of an operator, a promoter, and structural genes that are transcribed together.
operonic adjective: Relating to operons
operonically adverb: In an operonic manner
operonization noun: The formation of operons in a genome
operose adjective /ˈɒpəɹəʊs/: Of a person: busy, industrious, or painstaking.
operosely adverb: In an operose manner.
operoseness noun: The state of being operose; tedium.
operosity noun: Laboriousness; painstakingness.
opertaneous adjective /ɑ.pɚˈteɪ.ni.əs/: Concealed; private.
opetide noun /ˈəʊptʌɪd/: The open time; that part of the year outside Lent when there is no required fast.
opeway noun: A passageway.
OPEX noun: Acronym of operating expense or operating expenditure.
OPFOR noun: Abbreviation of opposing force.
opg. adjective: Abbreviation of opening.
opgaaf noun: A tax on produce, stock, and capitation.
ophan noun: A member of an order of wheel-like angels.
ophanin noun: A toxin present in the venom of the king cobra Ophiophagus hannah
ophecleide noun: Alternative spelling of ophicleide.
Ophelia proper noun /ɒˈfiː.lɪə/: A female given name from Ancient Greek.
Ophelian adjective /ə(ʊ)ˈfiːliən/: Depicting or pertaining to Ophelia.
ophelic adjective: Of or pertaining to felworts, of a former plant genus, Ophelia (now included in Swertia), of the gentian family.
ophelic acid noun: A substance obtained from chiratin by the action of acids.
opheliid noun: Any polychaete worm of the family Opheliidae.
ophelimity noun /ɒf.əˈlɪm.ə.tiː/: Economic satisfaction.
ophiacanthid noun /ˌoʊ.fi.əˈkæn.θɪd/: Any brittle star of the family Ophiacanthidae
ophiacodont noun: Any member of the Ophiacodontidae family of Carboniferous and Permian vertebrates
ophiacodontid noun: Any synapsid in the family Ophiacodontidae.
ophiactid noun: Any brittle star in the family Ophiactidae.
Ophian noun: Alternative form of Ophite.
ophiasis noun: A form of alopecia areata characterized by the loss of hair in the shape of a wave at the circumference of the head.
ophic adjective: Relating to snakes.
ophicalcite noun: ophite; verd antique
ophicephalous adjective: snake-headed
ophiceratid noun: Any member of the family †Ophiceratidae of extinct ammonite cephalopods.
ophichthid noun: Any eel in the family Ophichthidae.
ophicleide noun /ˈɒfɪklaɪd/: A keyed brass baritone bugle, now replaced by the tuba in orchestral music
ophicleidist noun: Someone who plays the ophicleide.
ophid- prefix: Of or pertaining to snakes
ophiderpetontid noun: Any tetrapod in the family Ophiderpetontidae.
ophidian adjective, noun /oʊˈfɪdi.ən/: Any species of the suborder Serpentes; a snake or serpent.
ophidianoside noun: A particular steroid glycoside.
ophidiarium noun /əˌfɪdɪˈɛəɹi.əm/: A place for keeping snakes.
ophidiasterid noun: Any starfish in the family Ophidiasteridae.
ophidic adjective: Relating to the Ophidia: the snakes and related reptiles.
ophidiid noun: Any in the family Ophidiidae of cusk-eels.
ophidiiform noun: Any ray-finned fish of the order Ophidiiformes
ophidine noun: The dipeptide β‐alanyl‐L‐3‐methylhistidine
ophidio- prefix: Alternative form of ophio-.
ophidioid noun: Any of the family Ophidiidae of cusk-eels.
ophidiomycosis noun: Any disease caused by the fungus Ophidiomyces
ophidiophobe noun: An ophiophobe; one who fears snakes.
ophidiophobia noun: Ophiophobia; a fear of snakes.
ophidiophobic adjective: relating to ophidiophobia; having fear of snakes
ophidism noun: Poisoning by snake venom.
-ophilic suffix: Alternative form of -philic.
ophio- prefix: Of or pertaining to snakes
ophiobolin noun: Any of a class of phytotoxic metabolites produced by certain fungi of the genus Helminthosporium
ophiocarpine noun: A protoberberine alkaloid.
ophiocephalous adjective: ophicephalous
ophiochitonid noun: Any brittle star of the genus Ophiochiton
ophiocistioid noun: Any echinoderm of the class †Ophiocistioidea.
ophiocomid noun: Any brittle star in the family Ophiocomidae.
ophiocordycipitaceous adjective: Of or relating to the Ophiocordycipitaceae.
ophiodermatid noun: Any brittle star in the family Ophiodermatidae.
ophioglossaceous adjective: Belonging to the family Ophioglossaceae of ferns.
ophioglossid noun: An adder's tongue fern, or one similar to such a fern.
ophiohelid noun: Any brittle star of the family Ophiohelidae
ophioid adjective: Snakelike.
ophiolater noun: A snake-worshipper.
ophiolatrous adjective: snake-worshipping
ophiolatry noun: snake worship
ophiolepidid noun: Any brittle star of the family Ophiolepididae.
ophioleucin noun: Any brittle star of the subfamily Ophioleucinae
ophioleucinid noun: Any brittle star of the family Ophioleucidae
ophiolite noun: An assemblage of mafic and ultramafic rock fragments of the ocean lithosphere that has been tectonically moved onto a continental margin or island.
ophiolitic adjective: Of or pertaining to sections of the oceanic crust and the subjacent upper mantle that have been uplifted or emplaced to be exposed within continental...
ophioliticlastic adjective: Being a clastic rock chiefly composed of ophiolitic materials.
ophiolitiferous adjective: Bearing ophiolite.
ophiolitologist noun: One who studies ophiolites.
ophiological adjective: Of or relating to ophiology.
ophiologist noun: One who studies ophiology; an expert on snakes.
ophiology noun: The study of snakes, a branch of herpetology.
ophiomancy noun: Divination using snakes.
ophiomorphic adjective: snake-shaped; serpentine
ophiomorphite noun: An ammonite.
ophiomorphous adjective: Having the form or shape of a snake.
ophion noun /ˈoʊ.fiˌɑn/: Any ichneumon wasp of the genus Ophion.
ophionereidid noun: Any brittle star of the family Ophionereididae
ophiophage noun: Any animal that eats snakes.
ophiophagous adjective: Feeding on snakes.
ophiophagy noun: The eating of snakes.
ophiophile noun: A person who loves snakes.
ophiophilist noun: Synonym of ophiophile (“person who loves snakes”).
ophiophobe noun: One who fears or hates snakes.
ophiophobia noun: A morbid fear of snakes.
ophiophobic adjective: Afraid of snakes.
ophiopluteus noun: A free-swimming larval stage of some brittle stars, having four pairs of rigid arms lined with cilia.
ophiopogon noun: Any evergreen plant of the genus Ophiopogon
ophiopogonin noun: A particular steroid glycoside.
ophiopojaponin noun: A particular steroid glycoside.
ophiopsid noun: Any extinct fish of the family Ophiopsidae
ophiostomataceous adjective: Belonging to the family Ophiostomataceae.
ophiostomatalean adjective: Relating to fungi of the order Ophiostomatales
ophiostomatoid adjective: Synonym of ophiostomatalean.
Ophiotaurus noun: A mythical creature, part bull and part serpent.
ophiothamnid noun: Any brittle star of the family Ophiothamnidae
ophiothricid noun: Any in the family Ophiotrichidae of brittle stars.
ophiotoxin noun: Any toxin present in a snake venom.
ophiotrichid noun: Any brittle star in the family Ophiotrichidae.
Ophir proper noun: A city or region mentioned in the Bible, famous for its gold.
Ophism noun: The doctrines and rites of the Ophites.
ophistotic noun: Alternative form of opisthotic.
ophite adjective, noun /ˈɒfʌɪt/: Any of various rocks having snake-like markings, such as a mottled greenish porphyry.
ophitic adjective: Having crystals of feldspar interspersed with plates of augite.
ophitically adverb: In an ophitic manner.
Ophitism noun: The religion of the Ophites.
Ophiuchid noun: A meteor of a meteor shower appearing to originate from Ophiuchus.
Ophiuchus proper noun /ˌɑf.iˈjuː.kəs/: A zodiacal constellation of the northern summer said to depict a man (Asclepius) holding a serpent; the serpent is the constellation Serpens.
ophiuran adjective, noun: Of or relating to the Ophiuroidea.
ophiure noun: Any echinoderm of the class Ophiuroidea
ophiuroid noun: An echinoderm of the class Ophiuroidea; the brittlestar.
ophiuroidean noun: Any brittle star of the class Ophiuroidea
ophrydeous adjective: Of or relating to the genus Ophrys of bee orchids.
ophrynopine adjective: Relating to sawflies of the genus Ophrynopus
ophryon noun: The point in the brow just above the optic foramen, or eyesocket, and glabella.
ophrys noun: Any orchid of the genus Ophrys, often vernacularly called bee orchids.
ophthal adjective, noun: Ophthalmology.
ophthalmalgia noun: pain in the eye
ophthalmalgic adjective: Relating to ophthalmalgia.
ophthalmate noun: Any salt of ophthalmic acid
ophthalmectomy noun: The enucleation of the eyeball.
ophthalmia noun /ɒfˈθælmiə/: Synonym of ophthalmitis (“inflammation of the eye”).
ophthalmia neonatorum noun: neonatal conjunctivitis
ophthalmic adjective /ɒfˈθal.mɪk/: Of or pertaining to the eyes.
ophthalmic acid noun: The tripeptide (N-(L-γ-glutamyl)-(2S)-2-aminobutyryl)glycine present in the lens of some animal eyes
ophthalmic artery noun: A branch of the internal carotid artery following the optic nerve through the optic foramen into the orbit and supplying the eye and adjacent structures.
ophthalmic nerve noun: One of the three major branches or divisions of the trigeminal nerve that supply sensory fibers to the lacrimal gland, eyelids, ciliary muscle, nose,...
ophthalmically adverb: In an ophthalmic manner
ophthalmics noun: Ophthalmic studies or industry.
ophthalmist noun: One skilled in ophthalmology.
ophthalmite noun: An eyestalk.
ophthalmitis noun /ˌɒfθælˈmaɪtɪs/: Severe conjunctivitis (inflammation of the conjunctiva).
ophthalmo- prefix /ɒfˌθæl.məʊ/: Of or relating to eyes.
ophthalmodynamometer noun: An instrument that is used to measure blood pressure in the blood vessels of the retina
ophthalmodynamometric adjective: Relating to ophthalmodynamometry.
ophthalmodynamometrically adverb: In terms of, or by means of, ophthalmodynamometry.
ophthalmodynamometry noun: The measurement of blood pressure in the blood vessels of the retina.
ophthalmodynia noun: Pain in the eye.
ophthalmodynia periodica noun: A primary headache disorder which causes stabbing sensations, usually in one area of the head.
ophthalmofundoscopy noun: ophthalmic fundoscopy
ophthalmogeometry noun: The positioning and separation of the eyes
ophthalmography noun: The scientific description of the eye.
ophthalmol noun: Abbreviation of ophthalmology.
ophthalmologic adjective: ophthalmological
ophthalmological adjective: Pertaining to ophthalmology.
ophthalmologically adverb: In an ophthalmological manner
ophthalmologist noun /ˌɒf.θælˈmɒ.lə.d͡ʒɪst/: A medical doctor specializing in the eye: deficiencies of vision requiring correction, and diseases. Compare optometrist.
ophthalmology noun /ˌɒfθə(l)ˈmɒləd͡ʒi/: The anatomy, functions, pathology, and treatment of the eye.
ophthalmometer noun: An instrument for measuring the size of a reflected image on the convex surface of the cornea and lens of the eye, by which their curvature can be...
ophthalmometric adjective: Relating to ophthalmometry.
ophthalmometry noun: Measurement of the visual acuity and refractive power of the eyes.
ophthalmomycosis noun: An eye disease caused by a fungus.
ophthalmomyiasis noun: Myiasis of the eye.
ophthalmoparesis noun: A partial or complete paralysis of the extraocular muscles which are responsible for eye movements.
ophthalmoparetic adjective: Of or relating to ophthalmoparesis.
ophthalmopathic adjective: Relating to eye disease.
ophthalmopathological adjective: Relating to ophthalmopathology
ophthalmopathology noun: pathology of the eyes
ophthalmopathy noun: eye disease
ophthalmophobia noun: Synonym of scopophobia.
ophthalmoplegia noun: A complete paralysis of the extraocular muscles which are responsible for eye movements.
ophthalmoplegic adjective: Relating to, or exhibiting, ophthalmoplegia.
ophthalmoplegy noun: Alternative form of ophthalmoplegia.
ophthalmosaur noun: Any of the genus †Ophthalmosaurus of ichthyosaurs.
ophthalmosaurid noun: Any ichthyosaur of the family Ophthalmosauridae
ophthalmosaurine noun: Any ophthalmosaurid of the subfamily Ophthalmosaurinae
ophthalmoscope noun: An instrument for examining the interior of the eye (that is, for ophthalmoscopy).
ophthalmoscopic adjective: Of, pertaining to or using an ophthalmoscope.
ophthalmoscopical adjective: Synonym of ophthalmoscopic.
ophthalmoscopically adverb: By means of ophthalmoscopy.
ophthalmoscopist noun: One who performs ophthalmoscopy.
ophthalmoscopy noun: Examination of the eye with an ophthalmoscope.
ophthalmosonometry noun: Sonometry of the eyes.
ophthalmospasm noun: A sudden involuntary contraction of the eyeball
ophthalmostat noun: A device that holds the eye steady during an operation
ophthalmotemporal adjective: Relating to the eye and the temple
ophthalmotherapy noun: Any therapy used against a disease or disorder of the eye.
ophthalmotomy noun: dissection of or incision into the eye
ophthalmotonometry noun /ɒfˌθælməʊtəˈnɒmətɹi/: Measurement of the intraocular tension.
ophthalmotrope noun: An instrument for demonstrating the movements of the eye muscles
ophthocillin noun /ˌɒfθəˈsɪlɪn/: Xantocillin.
OPI noun: Initialism of office of primary interest.
opia noun, suffix: vision (used to form names of visual defects)
opianic acid noun: An organic acid obtained by the oxidation of narcotine.
opianine noun: An alkaloid found in small quantities in opium, probably identical with narcotine.
opianyl noun: meconin

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.