| allantois | (noun) the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) | - |
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| altoist | (noun) a musician who plays the alto saxophone | Synonyms: alto saxophonist |
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| chorioallantois | (noun) the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois | Synonyms: chorioallantoic membrane |
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| patois | (noun) a regional dialect of a language (especially French); usually considered substandard | - |
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| (noun) a characteristic language of a particular group (as among thieves) | Synonyms: argot, cant, jargon, lingo, slang, vernacular |
| tortoise | (noun) usually herbivorous land turtles having clawed elephant-like limbs; worldwide in arid areas except Australia and Antarctica | - |
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| tortoiseshell | (noun) a cat having black and cream-colored and yellowish markings | Synonyms: calico cat, tortoiseshell-cat |
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| (noun) brilliantly colored; larvae feed on nettles | Synonyms: tortoiseshell butterfly |
| (noun) the mottled horny substance of the shell of some turtles | - |