English words: onomatopoetical to ool

300 English words, part 26 of 67 of the words starting with O, A to Z. 41 have a page of their own.

English words onomatopoetical to ool

onomatopoetical adjective: onomatopoeic
onomatopoetically adverb: In an onomatopoetic manner.
onomatopoetry noun: A type of poetry based around onomatopoeia.
onomatopoiesis noun: onomatopoeia
onomatopoietic adjective, noun: Alternative form of onomatopoetic.
onomatopoietical adjective: Alternative form of onomatopoetic.
onomatopoietically adverb: Alternative form of onomatopoetically.
-onomics suffix: Alternative form of -omics.
onomotopoetically adverb: By means of onomatopoeia.
-onomy suffix: Alternative form of -nomy.
Onoñda'gegá' noun: Synonym of Onondaga (people).
Onondaga noun: A member of a Native American tribe originally inhabiting Onondaga County, New York.
Onondagan adjective, noun: Of or relating to the Onondaga people.
ononin noun: An isoflavone, the 7-O-glucoside of formononetin, found in various plants and herbs, including the soybean.
onopordum noun: Any of the genus Onopordum of asteraceous thistles.
Onor proper noun: Former name of Honnavar (“Indian town”).
Onorato proper noun: A surname from Italian.
onoratoite noun: A monoclinic-prismatic white mineral containing antimony, chlorine, and oxygen.
Onore proper noun: Former name of Honnavar (“Indian town”).
onos noun: Synonym of epinetron (“Attic pottery item”).
onosecond noun: Alternative form of ohnosecond.
onosma noun: Any flowering plant of the genus Onosma, of the family Boraginaceae.
onotherapy noun: Donkey riding as physical therapy.
'onour noun, verb: Pronunciation spelling of honour.
onpass verb: To pass along or hand over.
onramp noun: Alternative form of on-ramp.
onreg'lar adjective: Pronunciation spelling of irregular.
onroad adjective: Alternative form of on-road.
onrush noun, verb /ˈɒnˌɹʌʃ/: A forceful rush or flow forward.
onrushing adjective, verb: rushing or flowing forward
onry adjective /ɔːn.ɹi/: Pronunciation spelling of ornery, representing Southern United States English.
Onsagerian adjective: Of or relating to Lars Onsager (1903–1976), Norwegian–American physical chemist and theoretical physicist, or his work on thermodynamics.
Onsagerism noun: The Onsagerian theories of thermodynamics.
Onsagerist noun: A proponent of Onsagerism.
onscreen adjective, adverb: As seen on a screen (as of television, film, or computer) rather than in real life.
onsell verb: To sell (a purchased item) to a second buyer.
onsen noun /ɒnˈsɛn/: A (Japanese) hot spring.
onsen tamago noun: A hard-boiled egg slow-cooked in the waters of an onsen.
onsend verb: To send; send on; send out; forward; transmit.
onset noun, verb /ˈɒnˌsɛt/: The initial phase of a disease or condition, in which symptoms first become apparent.
onsetter noun: A worker at the bottom of a mineshaft who exchanges the empty and full corves.
onsetting noun, verb: An onset; a beginning.
onshell adjective: That conforms to classical physics
onshore adjective, adverb, verb /ˈɒnʃɔː/: Moving from the sea towards the land.
onside adjective, noun: Not in an offside position; in the part of the playing area where one can legally play the ball, puck, etc.
onside kick noun: Alternative spelling of on-side kick.
onsides adjective, noun: Onside: in a legal position with respect to the ball and boundaries
onsie noun: Alternative form of onesie.
onsight adjective, verb: Without having previously seen the terrain.
onsite adjective, adverb: On or at a site.
onslaught noun /ˈɒn.slɔːt/: A fierce attack.
onslaughter noun: An onslaught.
onslip noun: Alternative form of on-slip.
Onslow proper noun: A male given name from the Germanic languages.
onst adverb: once
Onstad proper noun: A surname from Norwegian.
onstaffing noun: Synonym of onboarding.
onstage adjective, adverb: On the part of a stage that is visible to the audience.
onstead noun: A single farmhouse; a steading.
onstream adjective: Being produced.
onsweep noun /ˈɒn.swiːp/: A rapid arrival, especially one that is forceful.
onsweeping adjective: sweeping onward
ONT noun, suffix: Initialism of ortho-nitrotoluene.
ontake noun, verb: To take on; undertake; assume.
Ontarian adjective, noun /ɒnˈtɛə.ɹi.ən/: Of, from or relating to the province of Ontario, Canada.
Ontario proper noun /ɒnˈtɛə.ɹi.əʊ/: A province in eastern Canada. Capital: Toronto.
Ontario violet noun: Synonym of blue violet (“Viola sororia”).
ontazolast noun: A particular antiasthmatic drug.
ontic adjective: Ontological.
ontical adjective: Of or relating to ontology.
ontically adverb: In an ontic sense.
onticity noun: One's ontic attributes.
Ontiveros proper noun: A surname from Spanish.
onto adjective, prefix, preposition /ˈɒn.tuː/: Arriving upon or on top of (speaking of a physical or metaphorical movement).
onto function noun: Synonym of surjection.
ontoepistemological adjective: Relating to ontoepistemology.
ontoepistemologically adverb: In terms of ontoepistemology.
ontoepistemology noun: A form of agential realism that is at once an epistemology (theory of knowing), an ontology (theory of being), and an ethics.
ontogenesis noun: The generation and development of an individual organism from fertilization to adulthood.
ontogenetic adjective: Of or relating to ontogenesis.
ontogenetical adjective: ontogenetic
ontogenetically adverb: Synonym of ontogenically.
ontogeneticist noun: A geneticist whose speciality is ontogenesis
ontogenic adjective /ˌɒntoʊˈd͡ʒɛnɪk/: Synonym of ontogenetic
ontogenical adjective: Alternative form of ontogenic.
ontogenically adverb: With regard to ontogeny
ontogenist noun: One who studies ontogeny.
ontogeny noun /ɒnˈtɒdʒəni/: Synonym of ontogenesis.
ontogeny recapitulates phylogeny proverb: The physical, cultural, moral, or intellectual development of each individual passes through stages similar to the developmental stages of that individual's...
ontogimorph noun: A semaphoront identified via taxonomic ontogeny.
ontogram noun: A graphical representation of an ontology (branch of knowledge)
ontographic adjective: Relating to ontography.
ontographical adjective: Relating to ontography.
ontography noun: The study of how living creatures react to the physiographic environment.
ontologic adjective: ontological
ontological adjective /ˌɒntəˈlɒd͡ʒɪkəl/: Of or relating to ontology.
ontological argument noun: A type of argument which maintains that the existence of God can be deduced from an analysis of the concept of God.
ontological proof noun: Synonym of ontological argument.
ontological shock noun: The state of being forced to question one's worldview.
ontologically adverb: In an ontological manner.
ontologise verb: Alternative form of ontologize.
ontologism noun: An ideological system which maintains that God and divine ideas are the first object of our intelligence and the intuition of God's existence the first act...
ontologist noun: A scholar or theorist of ontology, or an adherent of a particular ontological doctrine.
ontologistic adjective: Of or relating to ontologism.
ontologization noun: Ontological analysis.
ontologize verb: To convert into ontological entities or express in ontological terms.
ontology noun /ɒnˈtɒləd͡ʒi/: The branch of metaphysics that addresses the nature or essential characteristics of being and of things that exist; the study of being qua being.
ontology alignment noun: The process of determining correspondences between concepts in ontologies.
ontology engineering noun: A field which studies the methods and methodologies for building ontologies.
Ontonagon proper noun: A village, the county seat of Ontonagon County, Michigan, United States.
ontonomous adjective: Pertaining to or characteristic of ontonomy; Involving the harmonious coexistence of disparate entities.
ontonomy noun: A philosophy of existence that emphasizes the harmonious coexistence of nonuniform entities.
ontop preposition: atop.
ontopragmatic adjective: Relating to ontopragmatics.
ONTOS noun: A light, armored anti-tank vehicle of a particular kind.
ontosophy noun: A comprehensive explanation for being (in contrast to merely a description of being, or a reason for being).
ontotheologian noun: One who studies ontotheology.
ontotheological adjective: Relating to ontotheology.
ontotheologically adverb: In terms of ontotheology.
ontotheologist noun: One who studies ontotheology.
ontotheology noun: The ontology of God and/or the theology of being; a tradition of philosophical theology first prominent among medieval scholastics, notably Duns Scotus.
ontotype noun: The hierarchical form of a genotype
ONU noun: Initialism of optical network unit.
Onuoha proper noun: A surname from Igbo.
onuphid noun: Any polychaete worm of the family Onuphidae.
onus noun /ˈəʊnəs/: A legal obligation.
onus probandi noun: The burden of proof, the onus; the duty of a party in a legal proceeding to prove an assertion of fact; it includes both the burden of production and the...
onward adjective, adverb, verb /ˈɒnwəd/: Moving forward.
onward and upward adverb: Alternative form of onwards and upwards.
onwardly adverb: onward
onwardness noun: Progress; advancement.
onwards adverb, verb: Onward.
onwards and upwards adverb: On to greater things.
onwiki adjective, adverb: Alternative form of on-wiki.
onwing adjective: On the wing(s) of an aircraft.
ony determiner: Alternative form of any.
onya interjection: good on you
onyalai noun: A form of thrombocytopenia found in Central Africa.
onych- prefix: Alternative form of onycho- (before a vowel)
onycha noun: the operculum of kinds of strombus or muricid, smoked as an ingredient in the Mosaic incense and pre-modern medicine
onychalgia noun: pain in the nails or claws.
onychauxis noun: Thickening of the nails without deformity.
onychectomy noun /ˌɒnɪˈkɛktəmi/: The surgical removal of a fingernail or toenail.
onychia noun /əʊˈnɪki.ə/: An infection of the nailbed, which more or less always also involves the nail itself (sometimes causing the nail to slough off).
onychial adjective /əʊˈnɪki.əl/: Of, related to, or being onychia (nailbed infection).
onychinus noun: onyx
onychitis noun: Synonym of onychia.
onychium noun: A little claw or clawlike appendage, present on some arthropods.
onychiurid noun: Any springtail of the family Onychiuridae
onycho- prefix: Nail: Relating to fingernails, toenails, or homologous structures such as claws or hooves.
onychochilid noun: Any extinct gastropod in the family Onychochilidae.
onychocryptosis noun: ingrown toenail
onychodermal band noun: A fine, pallid, translucent band at the junction of the distal nail bed and hyponychium.
onychodont noun: Synonym of onychodontid.
onychodontid noun: Any extinct fish the family Onychodontidae
onychodysplasia noun: dysplasia of the nails
onychodystrophic adjective: Relating to onychodystrophy.
onychodystrophy noun: Dystrophic changes in nails, such as deformations, malformations or discolourations.
onychogryphosis noun: A hypertrophy or excess growth of the nails.
onychogryphotic adjective: Related to, or characterised by onychogryphosis.
onychogryposis noun: thickening and curvature of the nails
onychology noun: The study of fingernails and toenails; the knowledge that such study produces; the clinical practice that benefits from it.
onycholysis noun: The loosening or separation of a fingernail or toenail from its bed
onychomadesis noun: Periodic idiopathic shedding of the nails beginning at their proximal ends, possibly caused by the temporary arrest of the function of the nail matrix.
onychomancy noun: An ancient form of divination based on the symbols that are reflected by sunlight on a person's fingernails.
onychomycosis noun /ˌɒnɪkəʊmaɪˈkəʊsɪs/: Fungal infection of the nail, especially the toenail.
onychomycotic adjective: Relating to or affected by onychomycosis.
onychoosteodysplasia noun: nail-patella syndrome
onychopathic adjective: Relating to onychopathy.
onychopathology noun: The study of diseases of the nails.
onychopathy noun: Any disease of the fingernails or toenails.
onychophagia noun: Nail biting.
onychophagist noun /ɒnɪˈkɒfəd͡ʒɪst/: A person who bites his or her fingernails.
onychophagy noun /oʊ̯.nɪˈkɒf.ə.d͡ʒi/: Nail biting.
onychophoran noun: Any of many wormlike carnivorous ecdysozoan animals of the phylum Onychophora.
onychopod noun: Any branchiopod crustacean of the suborder Onychopoda
onychopsin noun: Any of a group of opsins present in velvet worms of the phylum Onychophora
onychoptosis noun: Synonym of onychomadesis.
onychorrhexis noun: fingernail and toenail brittleness and breakage, such as may be due to excessive strong soap and water exposure, nail polish remover, hypothyroidism,...
onychoschisis noun: A condition where the nails split into layers.
onychoschizia noun /ˌɒnɪkəʊˈskɪziə/: Synonym of onychoschisis.
onychosis noun: Synonym of onychopathy.
onychostroma noun: The matrix or sensitive tissue of the finger, forming the bed of the nail.
onychoteuthid noun: Any squid in the family Onychoteuthidae.
onychotillomania noun: A compulsion for picking and tearing at one's fingernails or toenails.
onygenaceous adjective: Belonging to the Onygenaceae.
onygenalean adjective: Of or pertaining to the fungal order Onygenales.
-onym suffix /ə.nɪm/: Word.
onymity noun: The state of being onymous.
onymization noun: Synonym of proprialization.
onymous adjective /ˈɒn.ɪ.məs/: Having a name.
onymously adverb: In an onymous manner; having a name.
-onymy suffix: Used to form nouns describing the study, formation, or use of words or names.
onyx adjective, noun /ˈɒnɪks/: A banded variety of chalcedony, a cryptocrystalline form of quartz.
onyx marble noun: A banded variety of calcite of karst resembling onyx.
onyxitis noun: Alternative form of onychitis.
onz adjective, verb /ɒnz/: Taking place
onza noun: A traditional Spanish unit of mass, equivalent to about 28.76 g.
oo adjective, interjection, noun, prefix, symbol /ˈəʊ.əʊ/: (Ω, ω) The Greek letter omega.
oo arr interjection: Used to indicate agreement.
oo-er interjection: An expression of surprise or befuddlement.
oo-la-la interjection: Alternative spelling of ooh la la.
oo oo aa aa interjection /ˈʔuːʔuː ˈʔɑːʔɑː/: Used to represent the sound of a monkey's cry.
OOA noun: Initialism of object-oriented analysis.
ooaa noun /ˈoʊˌoʊˌɑːˌɑː/: Any member of the extinct species †Moho braccatus of oo birds of Hawaii.
OOAD noun: Initialism of object-oriented analysis and design.
OOAK noun: Initialism of one of a kind; widely used on the Internet by artists who make original items such as jewelry, dolls, weapons, art, clothing and other...
OOB adjective, noun: Abbreviation of Open(ing) Of Business, usually referring to a time frame margin.
OOBB noun: Initialism of object-oriented bounding box.
OOBE noun: Initialism of out-of-body experience or out-of-the-body experience.
oobit noun: A caterpillar.
ooblast noun: A cell that develops into an ovum; a germinal epithelium giving rise to ova.
ooblastic adjective: Relating to the ooblast.
oobleck noun /ˈuː.blɛk/: A mixture of cornstarch and water with unusual physical properties.
OOC adjective, adverb, noun: Initialism of organ-on-a-chip.
ooch interjection, noun, verb /uːt͡ʃ/: To move or slide (oneself or someone, or something) by a small amount.
OOCSS noun: Initialism of Object-oriented CSS.
oocyan noun: biliverdin
oocyanin noun /ɔʊ.ɒˈsaɪ̯.ə.nɪn/: The pigment (biliverdin) that makes certain eggs from Ameraucana hens blue and/or green.
oocyesis noun: Ovarian pregnancy: the type of ectopic pregnancy that occurs within an ovary.
oocyst noun /ˈəʊəsɪst/: A reproductive cell in certain fungi.
oocystic adjective: Relating to an oocyst.
oocyte noun /ˈəʊəsaɪt/: A cell that develops into an egg or ovum; a female gametocyte.
oocytectomise verb: To carry out an oocytectomy
oocytectomy noun: The removal of oocytes.
oocytelike adjective: Resembling or characteristic of an oocyte.
oocytic adjective: Relating to or composed of oocytes.
oocytogenesis noun: The creation and development of oocytes
OOD noun: Initialism of object-oriented design.
OODA phrase: Initialism of Observe, Orient, Decide, and Act, a decision cycle for military combat operations and other processes.
oodachi noun: Alternative spelling of odachi (“sword”).
oodiaulic adjective: Having two reproductive duct systems, a hermaphroditic one for copulation and one for depositing eggs.
oodle noun: A crossbreed of a poodle and another breed of dog.
oodles noun /ˈuːd(ə)lz/: unspecified large amount, number, or quantity; lots, tons.
oodlins noun: Alternative form of oodles (“lots; a great number or amount”).
ooecial adjective: Relating to the ooecium.
ooecium noun: An ovicell of a bryozoan.
ooer interjection: Said to acknowledge a double entendre or something that sounds sexually suggestive.
ooey-gooey adjective: gooey; sticky
oof interjection, noun /uːf/: A sound mimicking the loss of air, as if someone's solar plexus had just been struck.
oof-bird noun: Any source or supplier of money.
oofamily noun: An ootaxon, equivalent to a family, used to classify fossilised dinosaur eggs
oofbird noun: Alternative form of oof-bird.
oofda interjection: Alternative form of uff da.
ooff interjection: Alternative form of oof.
oofiness noun: The quality of being wealthy.
oofless adjective: Short of money; poor.
ooft interjection: Alternative form of oof.
oofta interjection: A mild expression of error, dismay, or concern (often in a comical sense).
ooftish noun /ˈuːf.tɪʃ/: Money.
oofy adjective /ˈuːfi/: Having lots of money rich, wealthy.
Oog proper noun: A town in Aynabo district, Sool region, Somaliland, or Somalia.
ooga booga interjection /ˌuːɡəˈbuːɡə/: A frightened or sarcastic imitation of foreign language.
oogabooga interjection: Alternative form of ooga booga.
oogamete noun: The female gamete; the egg cell or oosphere.
oogamous adjective: Of or relating to oogamy
oogamously adverb: In an oogamous manner.
oogamy noun /oʊˈɒɡəmi/: A form of anisogamy (heterogamy) in which the female gamete (e.g. ovum) is significantly larger than the male gamete (sperm) and is non-motile.
oogenesis noun /ˈoʊ.oʊ.d͡ʒɛn.ə.sɪs/: The formation and development of an oocyte or ovum
oogenetic adjective: Of or pertaining to oogenesis.
oogenic adjective: That produces oocytes
oogenotop noun: The egg-forming apparatus in trematodes.
oogenus noun: An ootaxon, equivalent to a genus, used to classify fossilised dinosaur eggs
oogeny noun: oogenesis
oogone noun /ˈəʊəɡəʊn/: Alternative spelling of oogone
oogonial adjective: of or pertaining to an oogonium
oogoniol noun: A particular fungal sex hormone.
oogonium noun: An immature ovarian egg within a developing fetus.
oogram noun: An image, typically of parasite eggs, produced by oography
oograph noun: A mechanical device for drawing the outline of a bird's egg.
oogruk noun: Synonym of bearded seal.
ooh adjective, interjection, noun, verb /uː/: An expression of surprise.
ooh ah ah interjection /ˈʔuːˌʔɑːˌʔɑː/: Synonym of oo oo aa aa (“used to represent the sound of a monkey's cry”).
ooh arrh interjection: Alternative form of oo arr.
ooh la la interjection /ˈuː.læ.læ/: A reply implying pretentiousness; often in response to another person's use of a big word, especially a loanword that English got from French.
ooh, matron interjection: Highlights a statement which contains a double entendre or appears sexually forward.
ooh ooh aah aah interjection: Alternative spelling of oo oo aa aa.
ooh-wee interjection: Expressing astonishment, admiration, dismay, excitement etc.
ooher noun: One who oohs (in various senses).
oohing noun, verb: An ooh sound.
oohrah interjection: Alternative form of oorah.
OOI adverb: Initialism of out of interest.
ooid adjective, noun /ˈəʊˌɔɪd/: A small calcium carbonate- or iron-coated grain found on the seafloor.
ooidal adjective: Egg-shaped.
ooja noun: Alternative form of oojah (“thing whose name is unknown”).
oojah noun: Something whose name is unknown or unimportant; a thingy; a whatsit.
oojah capivvy noun /ˌuːdʒɑː kəˈpɪvi/: Something that one cannot name or does not know the name of; a whatsit.
oojah-cum-pivvy noun: Alternative form of oojah capivvy (“an unknown thing; a whatsit”).
oojah-cum-spiff adjective: In good condition, fine, excellent.
oojamaflip noun: Something that one does not know the name of.
oojar noun: Alternative spelling of oojah (“thing whose name is unknown”).
oojiboo noun: An unspecified object; thingy; whatsit.
ook interjection, verb /uːk/: Used to represent the sound of the cry of an ape or monkey.
ookie cookie noun: Synonym of soggy biscuit (“masturbation game”).
ookinete noun: The motile zygote of a parasite of the malaria mosquito that forms an oocyst in the mosquito's gut
ookinetic adjective: Tending to produce the female element.
OOKP noun: Abbreviation of osteo-odonto-keratoprosthesis.
ookpik noun: A handicraft stuffed toy owl, often made from wolf fur, sealskin, or similar materials.
ooky-spooky adjective: Spooky.
ool noun: Initialism of object-oriented language.

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.