plural noun
Opis·​tho·​par·​ia | \ əˌpisthəˈpa(a)rēə\

Definition of Opisthoparia

: an order of trilobites including those in which the genal angles or spines are borne by the free cheeks

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!

Other Words from Opisthoparia

opisthoparian \ ⸗¦⸗⸗¦pa(a)rēən \ noun or adjective

History and Etymology for Opisthoparia

New Latin, from opisth- + -paria (from Greek pareia cheek)

Keep scrolling for more

Comments on Opisthoparia

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


to spread as a report or rumor

Get Word of the Day daily email!

Test Your Vocabulary

Confusing Words—A Quiz

  • alice with tweedle dee and tweedle dum
  • I invented a brand new toaster robot and ______ it "Sir Toasts-a-Lot."
Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

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!