翻訳と辞書 |
Plan"ula (), n.; pl. Planul (). [L., a little plane.] 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. (Zol.) The very young, free-swimming larva of the clenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia.
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