NOUN (1)

1. primitive echinoderms having five or more feathery arms radiating from a central disk;


ADJECTIVE (1)

1. of or relating to or belonging to the class Crinoidea;

The Collaborative International Dictionary of English v.0.48:

Crinoid \Cri"noid\ (kr[imac]"noid), a. [See Crinoidea.]
   (Zool.)
   Crinoidal. -- n. One of the Crinoidea.
   [1913 Webster]

WordNet (r) 3.0 (2006):

crinoid
    adj 1: of or relating to or belonging to the class Crinoidea
    n 1: primitive echinoderms having five or more feathery arms
         radiating from a central disk