Definitions

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

  • n. The medusa of certain hydrozoans.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any free-swimming gonophore of a hydroid; a hydroid medusa.

from the GNU version of the Collaborative International Dictionary of English

  • n. Any free-swimming gonophore of a hydroid; a hydroid medusa.

from The Century Dictionary and Cyclopedia

  • n. A wandering bud; the free medusoid of gymnoblastic hydrozoans; the gonophore of such hydroids, detached from the colony, leading an independent locomotory life, and discharging its mature sexual products into the sea: distinguished from the hedrioblast, or sedentary bud.

Etymologies

Greek planos, wandering (from plan─üsthai, to wander; see planet) + -blast.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Ancient Greek (Wiktionary)

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