plural noun Cri·noi·dea \krə̇ˈnȯidēə, -rīˈ-\

Definition of Crinoidea

  1. :  a large class of chiefly tropical or fossil echinoderms that have a more or less cup-shaped body provided with five or more feathery arms commonly bifurcated or many-branched and bearing pinnules, a mouth lying between the arms on the concave upper surface, and opposite the mouth usually a long jointed stalk fixed to the base of the body and having its opposite end divided into rhizoid processes that anchor the animal to the sea bottom — compare comatulid, sea lily


\krə̇ˈnȯidēən, (ˈ)krī¦-\ adjective or noun

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 crinoidea

New Latin, from Greek krinon lily + New Latin -oidea

First Known Use: 1821

Seen and Heard

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


to criticize severely

Get Word of the Day daily email!