planarian Meaning, Definition & Usage

  1. noun free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts
    planaria.

WordNet

Pla*na"ri*an noun
Definitions
  1. (Zoöl.) One of the Planarida, or Dendrocoela; any turbellarian worm. -- Pla*na"ri*an, a.

Webster 1913