Century Dictionary and Cyclopedia
- n. A generic name given to the bilateral larval form of some echinoderms, as a starfish, under the impression that it was a distinct animal: nearly the same as Brachiolaria. The term is retained to designate such larvæ or stage of development. See also cut under Asteroidea.
GNU Webster's 1913
- n. (Zoöl.) The larva of certain starfishes as developed in the free-swimming stage.
- From Latin bis twice + pinna feather. (Wiktionary)
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