| oviraptorid | (noun) advanced carnivorous theropods, characterized by their toothless, parrot-like beaks and, in several cases, elaborate crests | - |
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| ovoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: hepatoflavin, lactoflavin, riboflavin, vitamin B2, vitamin G |
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| ovoid | (adjective) rounded like an egg | Synonyms: egg-shaped, elliptic, elliptical, oval-shaped, oval, ovate, oviform, prolate |
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| (noun) an egg-shaped object | - |
| ovolo | (noun) a convex molding having a cross section in the form of a quarter of a circle or of an ellipse | Synonyms: quarter round, thumb |
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| ovotestis | (noun) hermaphroditic gonad that contains both testicular and ovarian tissue | - |
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| ovoviviparous | (adjective) producing living young from eggs that hatch within the body | - |
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| ovular | (adjective) of or relating to an ovum | - |
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| (adjective) being or of the nature of an ovule | - |
| ovulate | (verb) produce and discharge eggs | - |
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| ovulation | (noun) the expulsion of an ovum from the ovary (usually midway in the menstrual cycle) | - |
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| ovule | (noun) a small or immature ovum | - |
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| (noun) a small body that contains the female germ cell of a plant; develops into a seed after fertilization | - |
| ovum | (noun) the female reproductive cell; the female gamete | Synonyms: egg cell |
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