Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The flat, free-swimming, ciliated larva of a coelenterate.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • 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.
  • n. The larva of a hydrozoan, which is free-swimming and covered in cilia.

from the GNU version of the Collaborative International Dictionary of English

  • 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.
  • n. The very young, free-swimming larva of the cœlenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia.

from The Century Dictionary and Cyclopedia

  • n. The ordinary locomotory embryo of the cœlenterates, which is of flattened form, mouthless, ciliate, and free-swimming.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the flat ciliated free-swimming larva of hydrozoan coelenterates

Etymologies

New Latin plānula, from Latin, feminine diminutive of plānus, flat (from its shape); see pelə-2 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin, a little plane. (Wiktionary)

Examples

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