am·​ni·​ote | \ ˈam-nē-ˌōt How to pronounce amniote (audio) \

Definition of amniote

: any of a group (Amniota) of vertebrates that undergo embryonic or fetal development within an amnion and include the birds, reptiles, and mammals

Keep scrolling for more

Other Words from amniote

amniote adjective

Examples of amniote in a Sentence

Recent Examples on the Web This new kind of animal, that Dawson would name Hylonomus lyelli, remains the earliest amniote in the fossil record. Hillary Maddin, Smithsonian, "Tiny Animals Trapped in Fossil Trees Help Reveal How Fauna Moved Onto Land," 18 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'amniote.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of amniote

1878, in the meaning defined above

History and Etymology for amniote

New Latin Amniota, from amnion

Keep scrolling for more

Learn More about amniote

Time Traveler for amniote

Time Traveler

The first known use of amniote was in 1878

See more words from the same year

Statistics for amniote

Cite this Entry

“Amniote.” Dictionary, Merriam-Webster, Accessed 2 Jun. 2020.

Comments on amniote

What made you want to look up amniote? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

May 2020 Words of the Day Quiz

  • a blooming wisteria tree
  • Which is a synonym of exiguous?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!