- (a.) Of or pertaining to the Echinoidea.
- (n.) One of the Echinoidea.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). echinoid. Retrieved September 21, 2026, from http://smartdefine.org/echinoid/definitions/2001472 |
| Chicago | Webster's. 2011. "echinoid" http://smartdefine.org/echinoid/definitions/2001472 (accessed September 21, 2026). |
| Harvard | Webster's 2011, echinoid, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/echinoid/definitions/2001472>. |
| MLA | Webster's. "echinoid" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/echinoid/definitions/2001472> |