Source : Webster's Revised Unabridged Dictionary (1913)

Crinoid \Cri"noid\ (kr[imac]"noid), a. [See {Crinoidea}.]
   (Zo["o]l.)
   Crinoidal. -- n. One of the Crinoidea.

Source : WordNet®

crinoid
     adj : of or relating to or belonging to the class Crinoidea

crinoid
     n : primitive echinoderms having five or more feathery arms
         radiating from a central disk