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amniote

American

[am-nee-oht] / ˈæm niˌoʊt /

noun

any vertebrate of the group Amniota, comprising the reptiles, birds, and mammals, characterized by having an amnion during the embryonic stage.

amniote British

/ ˈæmnɪəʊt /

noun

any vertebrate animal, such as a reptile, bird, or mammal, that possesses an amnion, chorion, and allantois during embryonic development Compare anamniote

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

amniote Scientific

/ ăm′nē-ōt′ /

Any of the vertebrates that have an amnion during embryonic development. Reptiles, birds, and mammals are amniotes.

Etymology

Origin of amniote

< New Latin amniota; amnion, -ote

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The findings indicate that stem amniote relatives were experimenting with plant eating earlier than previously believed.

From Science Daily • Feb. 11, 2026

Victoria Gill, NYC, 2017 The only tattoo on Victoria’s body is the amniote vertebrae of a snake.

From The Guardian • Nov. 25, 2020

Snakes, the carnivorous reptiles of the suborder Serpentes, are universally sinister-looking amniote vertebrates.

From Slate • Aug. 6, 2019

The trunk of the amniote phylogenetic tree is the ancestral amniote.

From Textbooks • Jan. 1, 2015

Of the three vesicular appendages of the amniote embryo which we have now described the amnion has no blood-vessels at any moment of its existence.

From The Evolution of Man — Volume 1 by Haeckel, Ernst Heinrich Philipp August

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023