(n.pl.) One of the divisions of Crinoidea found fossil in paleozoic rocks; pentremites. They are so named on account of their budlike form.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Blastoidea. Retrieved September 20, 2026, from http://smartdefine.org/blastoidea/definitions/1980845 |
| Chicago | Webster's. 2011. "Blastoidea" http://smartdefine.org/blastoidea/definitions/1980845 (accessed September 20, 2026). |
| Harvard | Webster's 2011, Blastoidea, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/blastoidea/definitions/1980845>. |
| MLA | Webster's. "Blastoidea" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/blastoidea/definitions/1980845> |