| ox | (noun) any of various wild bovines especially of the genera Bos or closely related Bibos | Synonyms: wild ox |
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| (noun) an adult castrated bull of the genus Bos; especially Bos taurus | - |
| oxacillin | (noun) a form of penicillin resistant to penicillinase and effective against penicillin-resistant staphylococci | - |
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| oxalacetate | (noun) a salt or ester of oxalacetic acid | Synonyms: oxaloacetate |
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| oxalate | (noun) a salt or ester of oxalic acid | - |
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| oxalis | (noun) any plant or flower of the genus Oxalis | Synonyms: sorrel, wood sorrel |
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| oxaloacetate | (noun) a salt or ester of oxalacetic acid | Synonyms: oxalacetate |
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| oxaprozin | (noun) a nonsteroidal anti-inflammatory drug (trade name Daypro) | Synonyms: Daypro |
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| oxazepam | (noun) a tranquilizing drug (trade name Serax) used to treat anxiety and insomnia and alcohol withdrawal | Synonyms: Serax |
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| oxbow | (noun) a wooden framework bent in the shape of a U; its upper ends are attached to the horizontal yoke and the loop goes around the neck of an ox | - |
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| (noun) a U-shaped curve in a stream | - |
| (noun) the land inside an oxbow bend in a river | - |
| oxcart | (noun) a cart that is drawn by an ox | - |
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| oxen | (noun) domesticated bovine animals as a group regardless of sex or age | Synonyms: Bos taurus, cattle, cows, kine |
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| oxeye | (noun) an oval or round dormer window | - |
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| (noun) Eurasian perennial herbs having daisylike flowers with yellow rays and dark centers | - |
| (noun) any North American shrubby perennial herb of the genus Heliopsis having large yellow daisylike flowers | Synonyms: heliopsis |
| oxford | (noun) a low shoe laced over the instep | - |
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| oxheart | (noun) large heart-shaped sweet cherry with soft flesh | Synonyms: heart cherry, oxheart cherry |
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| (noun) any of several cultivated sweet cherries having sweet juicy heart-shaped fruits | Synonyms: heart cherry, oxheart cherry |
| oxidant | (noun) a substance that oxidizes another substance | Synonyms: oxidiser, oxidizer, oxidizing agent |
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| oxidase | (noun) any of the enzymes that catalyze biological oxidation | - |
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| oxidation | (noun) the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction | Synonyms: oxidisation, oxidization |
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| oxide | (noun) any compound of oxygen with another element or a radical | - |
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| oxidisation | (noun) the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction | Synonyms: oxidation, oxidization |
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| oxidiser | (noun) a substance that oxidizes another substance | Synonyms: oxidant, oxidizer, oxidizing agent |
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| oxidization | (noun) the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction | Synonyms: oxidation, oxidisation |
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| oxidizer | (noun) a substance that oxidizes another substance | Synonyms: oxidant, oxidiser, oxidizing agent |
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| oxidoreductase | (noun) an enzyme that catalyzes oxidation-reduction | - |
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| oxidoreduction | (noun) a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction | Synonyms: oxidation-reduction, redox |
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| oxime | (noun) any compound containing the group -C=NOH | - |
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| oximeter | (noun) a measuring instrument that measures the oxygen in arterial blood | - |
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| oxlip | (noun) Eurasian primrose with yellow flowers clustered in a one-sided umbel | Synonyms: paigle, Primula elatior |
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| oxtail | (noun) the skinned tail of cattle; used especially for soups | - |
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| oxtant | (noun) a unit of angular distance equal to half a quadrant | - |
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| oxtongue | (noun) widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States | Synonyms: bitterweed, bristly oxtongue, bugloss, Picris echioides |
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| oxyacetylene | (noun) a mixture of oxygen and acetylene; used to create high temperatures for cutting or welding metals | - |
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| oxyacid | (noun) any acid that contains oxygen | Synonyms: oxygen acid |
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| oxybenzene | (noun) a toxic white soluble crystalline acidic derivative of benzene; used in manufacturing and as a disinfectant and antiseptic; poisonous if taken internally | Synonyms: carbolic acid, hydroxybenzene, phenol, phenylic acid |
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| oxycephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: acrocephaly |
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| oxygen | (noun) a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust | Synonyms: atomic number 8, O |
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| oxygenase | (noun) an oxidoreductase that catalyzes the incorporation of molecular oxygen | - |
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| oxygenation | (noun) the process of providing or combining or treating with oxygen | - |
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| oxyhaemoglobin | (noun) the bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs | Synonyms: oxyhemoglobin |
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| oxyhemoglobin | (noun) the bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs | Synonyms: oxyhaemoglobin |
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| oxymoron | (noun) conjoining contradictory terms (as in `deafening silence') | - |
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| oxyopia | (noun) unusually acute vision | - |
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| oxyphenbutazone | (noun) an anti-inflammatory drug (trade name Tandearil) used to treat arthritis and bursitis | Synonyms: Tandearil |
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| oxyphencyclimine | (noun) an anticholinergic drug (trade name Daricon) used in treating peptic ulcers | Synonyms: Daricon |
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| oxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: hydroxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| oxytocic | (noun) a drug that induces labor by stimulating contractions of the muscles of the uterus | Synonyms: oxytocic drug |
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| oxytocin | (noun) hormone secreted by the posterior pituitary gland (trade name Pitocin); stimulates contractions of the uterus and ejection of milk | Synonyms: Pitocin |
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| oxytone | (noun) word having stress or an acute accent on the last syllable | - |
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