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The Collaborative International Dictionary
Planoblast

Planoblast \Plan"o*blast\, n. [Gr. ? to wander + -blast.] (Zo["o]l.) Any free-swimming gonophore of a hydroid; a hydroid medusa.

Wiktionary
planoblast

n. (context zoology English) Any free-swimming gonophore of a hydroid; a hydroid medusa.