plural noun
An·​ap·​si·​da | \ -sədə\

Definition of Anapsida

: a subclass of Reptilia comprising primitive forms in which the skull lacks temporal openings and including chiefly Permian forms with the turtles as its only present representatives

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of Anapsida

1917, in the meaning defined above

History and Etymology for Anapsida

New Latin, from an- + -apsida (from Greek apsid-, apsis loop, arch)

Keep scrolling for more

Learn More about Anapsida

Statistics for Anapsida

Look-up Popularity

Time Traveler for Anapsida

The first known use of Anapsida was in 1917

See more words from the same year

Comments on Anapsida

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


a period when something is suspended

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
True or False

Test your knowledge - and maybe learn something along the way.

Word Winder's CrossWinder

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!