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1. (n.) planula
the free-swimming larva of a cnidarian.
Etymology: (1865–70; < NL, dim. of L plānum something flat. See plane1, -ule)
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| Definition of 'planula' |
Princeton's WordNet |
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1. (noun) planula
the flat ciliated free-swimming larva of hydrozoan coelenterates
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| Definition of 'planula' |
Webster Dictionary |
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1. (noun) planula
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. (noun) planula
the very young, free-swimming larva of the coelenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia
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Definitions of planula 
