Meaning of planarian

pla•nar•i•an

Pronunciation: (plu-nâr'ē-un), [key]
— n. Zool.
  1. any of various free-swimming, mostly freshwater flatworms of the class Turbellaria, having an undulating or sluglike motion: popular in laboratory studies for the ability to regenerate lost parts.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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