Pentacrinin :: Pentacrinin (n.) A red and purple pigment found in certain crinoids of the genus Pentacrinus.
Pentacrinoid :: Pentacrinoid (n.) An immature comatula when it is still attached by a stem, and thus resembles a Pentacrinus..
Pentacrinus :: Pentacrinus (n.) A genus of large, stalked crinoids, of which several species occur in deep water among the West Indies and elsewhere..