Amniota :: Amniota (n. pl.) That group of vertebrates which develops in its embryonic life the envelope called the amnion. It comprises the reptiles, the birds, and the mammals..
Amniotic :: Amniotic (a.) Of or pertaining to the amnion; characterized by an amnion; as, the amniotic fluid; the amniotic sac..
Anamniotic :: Anamniotic (a.) Without, or not developing, an amnion..