Source : Webster's Revised Unabridged Dictionary (1913)

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