Amniota

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Amniota \Am`ni*o"ta\, n. pl. [NL. See {Amnion}.] (Zool.)
     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]



From WordNet (r) 2.0 [wn]:

  Amniota
       n : higher vertebrates (reptiles, birds and mammals) possessing
           an amnion during development