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The Collaborative International Dictionary
Pentacrinoid

Pentacrinoid \Pen*tac"ri*noid\, n. [Pentacrinus + -oid.] (Zo["o]l.) An immature comatula when it is still attached by a stem, and thus resembles a Pentacrinus.

Wiktionary
pentacrinoid

n. (context zoology English) An immature comatula when it is still attached by a stem.