'Blastoidea' definitions:

Definition of 'Blastoidea'

From: GCIDE

Blastoidea \Blas*toid"e*a\, n. pl. [NL., fr. Gr. blasto`s sprout + -oid.] (Zool.) One of the divisions of Crinoidea found fossil in paleozoic rocks; pentremites. They are so named on account of their budlike form. [1913 Webster]