amniote

[am-nee-oht]
noun
any vertebrate of the group Amniota, comprising the reptiles, birds, and mammals, characterized by having an amnion during the embryonic stage.
Compare anamniote.


Origin:
< Neo-Latin amniota; see amnion, -ote

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World English Dictionary
amniote (ˈæmnɪəʊt)
 
n
Compare anamniote any vertebrate animal, such as a reptile, bird, or mammal, that possesses an amnion, chorion, and allantois during embryonic development

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
amniote   (ām'nē-ōt')  Pronunciation Key 
Any of the vertebrates that have an amnion during embryonic development. Reptiles, birds, and mammals are amniotes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

amniote

a group of limbed vertebrates that includes all living reptiles (class Reptilia), birds (class Aves), mammals (class Mammalia), and their extinct relatives and ancestors. The amniotes are the evolutionary branch (clade) of the tetrapods (superclass Tetrapoda) in which the embryo develops within a set of protective extra-embryonic membranes-the amnion, chorion, and allantois.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
They also reduced their reliance on wetland habitats through a crucial evolutionary adaptation known as the amniote egg.
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