- (a.) Of or pertaining to a gastrula.
- (n.) An embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giving rise to a double-walled sac, with one opening or mouth (the blastopore) which leads into the cavity (the archenteron) lined by the inner wall (the hypoblast). See Illust. under Invagination. In a more general sense, an ideal stage in embryonic development. See Gastraea.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). gastrula. Retrieved September 25, 2026, from http://smartdefine.org/gastrula/definitions/2011522 |
| Chicago | Webster's. 2011. "gastrula" http://smartdefine.org/gastrula/definitions/2011522 (accessed September 25, 2026). |
| Harvard | Webster's 2011, gastrula, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/gastrula/definitions/2011522>. |
| MLA | Webster's. "gastrula" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/gastrula/definitions/2011522> |