Pin·​no·​the·​res | \ ˌpinəˈthi(ˌ)rēz \

Definition of Pinnotheres

: a genus (the type of the family Pinnotheridae) of small crabs (as the oyster crab and the pea crab) having usually a thin membranous covering and living as commensals in the mantle cavity of various bivalve mollusks or in some similar cavity in other marine animals

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!

History and Etymology for Pinnotheres

New Latin, from Latin pinoteres, pinotheres crab living in the mantle cavity of the pen shell, from Greek pinotērēs, from pino- (from pinē pen shell) + -tērēs (from tērein to guard)

Keep scrolling for more

Learn More about Pinnotheres

Statistics for Pinnotheres

Cite this Entry

“Pinnotheres.” Dictionary, Merriam-Webster, Accessed 8 Mar. 2021.

Style: MLA
MLA Chicago APA Merriam-Webster
Comments on Pinnotheres

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


Test Your Vocabulary

Who Knew?

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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