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planula |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Planula \Plan"u*la\, n.; pl {Planul[ae]}. [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}.
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