Word origins

• oenochoeA type of Ancient Greek pottery wine jug.
• ŒnoëA city in Greece.
• œnolinColouring matter of any grapes and red wines.
• oenomancydivination by studying wine
• œnophorumA vessel (such as a jug or basket) for holding or transporting wine or wine bottles.
• ŒnophytaGrecian village located in the eastern region of Boeotia.
• oenopoeticOf or pertaining to winemaking; vinicultural.
• ŒnotriaAncient territory in southern Italy.
• ŒnotrusOne of the younger sons of Lycaon.
• OetaeaA small upland district located south of Thessaly (of which it was sometimes considered a part). It was closely linked with the district of Aeniania, sharing a location in the valley of the Spercheios.
• ogdo-Synonym of octo-.
• ogdoadA thing made up of eight parts.
• ogdohedralHaving hemimorphic trigonal pyramidal symmetry
• OgygiaThe island home of the nymph Calypso, where she entertained Odysseus for seven years.
• oikeiosisThe perception of something as being one's own, or belonging to oneself.
• oikocrystAn enclosing crystal in a poikilitic fabric.
• oikologyThe science of houses and homes, considered especially in respect of their sanitary conditions.
• oikonymA type of toponym denoting a settlement or its part.
• oikophobeOne who suffers from oikophobia, especially one who identifies with a global group rather than feelings of patriotism or chauvinism.
• oikophobiaEcophobia; fear of a home environment.
• oikophobicExhibiting or characterized by oikophobia, a dislike of one's own culture or compatriots.
• oikumeneThe civilized world or inhabited world; the location and time in the known world where human civilization exists.
• OizysThe (female) personification of pain and distress; said by Hesiod is his Theogony to be the offspring of Nyx (Night) and produced without the assistance of a father; identified with the Roman Miseria (Misery).
• OkeanosSynonym of Oceanus (“god and personification of the world ocean”).
• oligaemiaThe condition of having a low quantity of blood.
• oligo-few, several
• oligodipsiaPathologically reduced or absent sense of thirst.
• oligolecticRelating to, or characteristic of, oligolecty.
• oligolectyThe preference of an insect pollinator (chiefly a bee) for pollinating only a few plant species.
• oligopsonyAn economic condition in which a small number of buyers exert control over the market price of a commodity.
• olisbosA dildo.
• olistolithAny of a mass of blocks of rock or mud that make up an olistostrome.
• olistostromeA sedimentary deposit composed of a chaotic mass of heterogeneous material, such as blocks and mud, known as olistoliths, that accumulates as a semifluid body by submarine gravity sliding or slumping of the unconsolidated sediments.
• -omaForming nouns indicating disease or morbidity.
• omalgiapain in the shoulder
• ombro-Forms words related to rain.
• ombrophyteAny plant that is adapted to rainy conditions or habitats
• -omeA mass of something.
• ommatidiumOne of the conical substructures which make up the eyes of invertebrates with compound eyes.
• ommatophoreAn eyestalk.
• omo-Of or pertaining to the shoulder and scapula.
• omodyniapain in the shoulder
• omophagiaThe eating of raw food, especially raw flesh.
• omostegiteThe part of the carapace of a crustacean situated behind the cervical groove.
• omphacineMade from unripe olives.
• omphaciteAny of a range of green, monoclinic pyroxene minerals found in eclogites and similar rocks; they are solid solutions of jadeite and diopside.
• omphacomelA form of mead made with verjuice.
• omphalo-Relating to the navel.
• omphaloidShaped like a navel.
• omphalomesaraicSynonym of omphalomesenteric.
• omphalosAn ancient religious stone artifact, or baetylus, used to denote the direction of the "center" of the world.
• Omphalos hypothesisThe proposition that God created the universe within the past few thousands of years but also introduced false evidence that the universe is of great age.
• omphaloskepsisThe contemplation of or meditation upon one's navel; navel-gazing.
• omphaloskepticOne who contemplates or meditates upon one's navel; one who engages in omphaloscopy.
• -oncusUsed to form names of conditions involving a tumor, swelling, or mass.
• oneiricOf or pertaining to dreams.
• oneiro-dream
• oneirocrisyPrognostication based on the interpretation of dreams.
• oneirocriticAn interpreter of dreams.
• oneirocriticalOf or relating to the interpretation of dreams.
• OneiroiThe gods and personifications of dreams; the sons of Hypnos and Pasithea, or Nyx and Erebus.
• oneiroidCharacterized by a dream-like or nightmare-like state, often as part of schizophrenia.
• one swallow does not a summer makeOne instance of an event (such as the arrival of a single bird) does not necessarily indicate a trend.
• oniochalasiaThe act of purchasing objects as a form of mental relaxation.
• oniomaniaAn abnormal impulse to buy things, or a condition characterised by such impulses.
• onkosA kind of headdress in Ancient Greek theatre.
• onomancydivination by the letters of a name; nomancy
• onomasticOf or relating to a personal or place name.
• onomasticonA book, list, or vocabulary of names, especially of people.
• onomato-name
• onomatopoesyThe use of onomatopoeia.
• onomatopoieticAn onomatopoietic word.
• onosSynonym of epinetron (“Attic pottery item”).
• onotherapyDonkey riding as physical therapy.
• -ontIndicating a life-form or life-stage, especially with regards to reproduction.
• onto-being
• OntosA light, armored anti-tank vehicle of a particular kind.
• onycho-Nail: Relating to fingernails, toenails, or homologous structures such as claws or hooves.
• onychocryptosisingrown toenail
• onychomadesisPeriodic idiopathic shedding of the nails beginning at their proximal ends, possibly caused by the temporary arrest of the function of the nail matrix.
• onychotillomaniaA compulsion for picking and tearing at one's fingernails or toenails.
• -onymWord.
• -onymousHaving a specified number or type of names.
• -onymyUsed to form nouns describing the study, formation, or use of words or names.
• oo-Relating to eggs or ova.
• ooidA small calcium carbonate- or iron-coated grain found on the seafloor.
• oomancyDivination through the use of eggs.
• oophoronSynonym of ovary.
• oostegiteOne of the plates which, in some crustaceans, enclose a cavity in which the eggs are hatched.
• -opeEye
• ophid-Of or pertaining to snakes
• ophidiariumA place for keeping snakes.
• ophio-Of or pertaining to snakes
• ophiolatrysnake worship
• OphiotaurusA mythical creature, part bull and part serpent.
• ophiothricidAny in the family Ophiotrichidae of brittle stars.
• ophiteAny of various rocks having snake-like markings, such as a mottled greenish porphyry.
• ophryonThe point in the brow just above the optic foramen, or eyesocket, and glabella.
• ophthalmo-Of or relating to eyes.
• opisometerA device for measuring the length of curved lines, such as on a map.