Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of a group of vertebrates that have an amnion during embryonic development, including reptiles, birds, and mammals.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of the Amniota group of vertebrates having an amnion during the development of the embryo; mammals, birds and reptiles.

from the GNU version of the Collaborative International Dictionary of English

  • n. any member of the Amniota.

from The Century Dictionary and Cyclopedia

  • Possessing an amnion; amniotic.
  • n. A member of the Amniota.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any member of the Amniota

Etymologies

From New Latin amniōta, amniotes, from Greek amniōn, amnion (influenced by amniotic).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Scientific Latin Amniota. (Wiktionary)

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