Thesaurus: planula

Related headwords

Definitions

1. 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.
2. 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.
3. n. the flat ciliated free-swimming larva of hydrozoan coelenterates
4. 1. (Biol.) 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. 2. (Zoöl.) The very young, free-swimming larva of the coelenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia.
5. In embryonic development, a vesicle filled with fluid, formedfrom the morula by the divergence of its cells in such a manner as togive rise to a central space, around which the cells arrangethemselves as an envelope; an embryonic form intermediate between themorula and gastrula. Sometimes used as synonymous with gastrula.
6. n the flat ciliated free-swimming larva of hydrozoan coelenterates