Glossary · Nouns · O
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TermTypeDefinitionClassificationsUpdated
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
Oyster PlantnounMWEMediterranean biennial herb with long-stemmed heads of purple ray flowers and milky sap and long edible rootverified
Oysters RockefellernounMWEoysters spread with butter and spinach and seasonings and baked on the half shellverified
Ozaenanouna chronic disease of the nose characterized by a foul-smelling nasal discharge and atrophy of nasal structuresverified
Ozark HarpnounMWEa small lyre-shaped musical instrument that is placed between the teeth and played by twanging a wire tongue while changing the shape of the mouth cavityverified
Ozenanouna chronic disease of the nose characterized by a foul-smelling nasal discharge and atrophy of nasal structuresverified
Ozoceritenouna waxy mineral that is a mixture of hydrocarbons and occurs in association with petroleumverified
Ozokeritenouna waxy mineral that is a mixture of hydrocarbons and occurs in association with petroleumverified
Ozone HolenounMWEan area of the ozone layer (near the poles) that is seasonally depleted of ozoneverified
Ozone LayernounMWEa layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sunverified
Ozone SicknessnounMWEillness that can occur to persons exposed to ozone in high-altitude aircraftverified
Ozonidenounany of a class of unstable chemical compounds resulting from the addition of ozone to a double bond in an unsaturated compoundverified
Ozonospherenouna layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sunverified