plural noun An·ap·si·da \-sədə\

Definition of Anapsida

  1. :  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.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of anapsida

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

First Known Use: 1917

Seen and Heard

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


a trip made at another's expense

Get Word of the Day daily email!