Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of blastoid is as below...

Pentremites :: Pentremites (n.) A genus of crinoids belonging to the Blastoidea. They have five petal-like ambulacra.

Blastoid :: Blastoid (n.) One of the Blastoidea.

Crinoidea :: Crinoidea (n. pl.) A large class of Echinodermata, including numerous extinct families and genera, but comparatively few living ones. Most of the fossil species, like some that are recent, were attached by a jointed stem. See Blastoidea, Cystoidea, Comatula..

Blastoidea :: Blastoidea (n. pl.) One of the divisions of Crinoidea found fossil in paleozoic rocks; pentremites. They are so named on account of their budlike form.

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