amniota amnios • Amniota · · · Info · Definitions · Characters · · amniota · · Text Latin · · Script 7 · · Length 3 · · Syllables Definitions · · · (noun) higher vertebrates (reptiles, birds and mammals) possessing an amnion during development. Synonyms: Amniota. · · Noun Definition 1 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074