Glossary · Nouns · O
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TermTypeDefinitionClassificationsUpdated
Ovolonouna convex molding having a cross section in the form of a quarter of a circle or of an ellipseverified
Ovulationnounthe expulsion of an ovum from the ovary (usually midway in the menstrual cycle)verified
Ovulation MethodnounMWEnatural family planning in which the fertile period is inferred from changes in the character and quantity of cervical mucusverified
Owlnounnocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyesverified
Owlclawsnounstout perennial herb of western United States having flower heads with drooping orange-yellow raysverified
Own GoalnounMWE(soccer) a goal that results when a player inadvertently knocks the ball into the goal he is defendingverified
Own RightnounMWEby title vested in yourself or by virtue of qualifications that you have achievedverified
Oxacillinnouna form of penicillin resistant to penicillinase and effective against penicillin-resistant staphylococciverified
Oxalacetic AcidnounMWEan acid formed by oxidation of maleic acid (as in metabolism of fats and carbohydrates)verified
Oxalic AcidnounMWEa toxic colorless crystalline organic acid found in oxalis and other plantsverified
Oxaloacetic AcidnounMWEan acid formed by oxidation of maleic acid (as in metabolism of fats and carbohydrates)verified
Oxazepamnouna tranquilizing drug (trade name Serax) used to treat anxiety and insomnia and alcohol withdrawalverified
Oxbow LakenounMWEa crescent-shaped lake (often temporary) that is formed when a meander of a river is cut off from the main channelverified
Oxbridgenoungeneral term for an ancient and prestigious and privileged university (especially Oxford University or Cambridge University)verified
Oxeyenounany North American shrubby perennial herb of the genus Heliopsis having large yellow daisylike flowersverified
Oxheart CherrynounMWEany of several cultivated sweet cherries having sweet juicy heart-shaped fruitsverified
Oxidation-Reductionnouna reversible chemical reaction in which one reaction is an oxidation and the reverse is a reductionverified
Oxidation-Reduction IndicatornounMWEan indicator that shows a reversible color change between oxidized and reduced formsverified
Oxidative PhosphorylationnounMWEan enzymatic process in cell metabolism that synthesizes ATP from ADPverified
Oxidoreductionnouna reversible chemical reaction in which one reaction is an oxidation and the reverse is a reductionverified
Oxygennouna nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gasverified
Oxyhaemoglobinnounthe bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungsverified
Oxyhemoglobinnounthe bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungsverified
Oxyphenbutazonenounan anti-inflammatory drug (trade name Tandearil) used to treat arthritis and bursitisverified
Oxyphencycliminenounan anticholinergic drug (trade name Daricon) used in treating peptic ulcersverified
Oxytocicnouna drug that induces labor by stimulating contractions of the muscles of the uterusverified
Oxytocic DrugnounMWEa drug that induces labor by stimulating contractions of the muscles of the uterusverified
Oyster AgaricnounMWEedible agaric with a soft greyish cap growing in shelving masses on dead woodverified
Oyster FungusnounMWEedible agaric with a soft greyish cap growing in shelving masses on dead woodverified
Oyster MushroomnounMWEedible agaric with a soft greyish cap growing in shelving masses on dead woodverified