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planoblast

[plan-uh-blast]
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noun Zoology.
  1. the medusa of a hydroid.

Origin of planoblast

First recorded in 1870–75; plano-2 + -blast
Related formsplan·o·blas·tic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018