- (n.) In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula. Sometimes used as synonymous with gastrula.
- (n.) The very young, free-swimming larva of the coelenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). planula. Retrieved September 20, 2026, from http://smartdefine.org/planula/definitions/2046172 |
| Chicago | Webster's. 2011. "planula" http://smartdefine.org/planula/definitions/2046172 (accessed September 20, 2026). |
| Harvard | Webster's 2011, planula, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/planula/definitions/2046172>. |
| MLA | Webster's. "planula" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/planula/definitions/2046172> |