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Latin, a little plane.
planula (plural planulae)
- (biology) 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.
- (zoology) The larva of a hydrozoan, which is free-swimming and covered in cilia.