| oviduct | (noun) either of a pair of tubes conducting the egg from the ovary to the uterus | Synonyms: Fallopian tube, uterine tube |
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| oviform | (adjective) rounded like an egg | Synonyms: egg-shaped, elliptic, elliptical, oval-shaped, oval, ovate, ovoid, prolate |
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| ovine | (adjective) of or pertaining to or of the nature of or characteristic of a sheep or sheep | - |
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| oviparous | (adjective) egg-laying | - |
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| ovipositor | (noun) egg-laying tubular structure at the end of the abdomen in many female insects and some fishes | - |
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| oviraptorid | (noun) advanced carnivorous theropods, characterized by their toothless, parrot-like beaks and, in several cases, elaborate crests | - |
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