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.