Definition of Pentacrinus
: a genus (the type of the family Pentacrinidae) comprising large stalked Jurassic crinoids having a small bowl-shaped calyx, strong numerously branched and pinnulate arms, and a pentangular stalk
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!
Origin and Etymology of pentacrinus
New Latin, from penta- (from Greek) + -crinus
Seen and Heard
What made you want to look up Pentacrinus? Please tell us where you read or heard it (including the quote, if possible).