plural noun Pri·ono·des·ma·cea \ˌprīə(ˌ)nōˌdezˈmāsēə; prīˌänō-, prīˌōnō-\

Definition of Prionodesmacea

in some classifications

  1. :  a division of Lamellibranchia comprising comparatively primitive bivalve mollusks that typically have the hinge prionodont and being approximately equal to the combined orders Protobranchia and Filibranchia


noun or adjective


\-shəs\ adjective

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 prionodesmacea

New Latin, from prion- + desm- + -acea

Seen and Heard

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


a rounded knoll or a ridge of ice

Get Word of the Day daily email!