amniota

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WORDNET DICTIONARY

Noun amniota has 1 sense

amniota(n = noun.animal) - higher vertebrates (reptiles, birds and mammals) possessing an amnion during development;

is a kind of craniate, vertebrate

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CIDE DICTIONARY

amniota, n. pl. [NL. See Amnion.].

That group of vertebrates which develops in its embryonic life the envelope called the amnion. It comprises the reptiles, the birds, and the mammals. [1913 Webster]