Source : Webster's Revised Unabridged Dictionary (1913)

Planarian \Pla*na"ri*an\, n. (Zo["o]l.)
   One of the Planarida, or Dendroc[oe]la; any turbellarian
   worm. -- {Pla*na"ri*an}, a.

Planarian \Pla*na"ri*an\, n. (Zo["o]l.)
   One of the Planarida, or Dendroc[oe]la; any turbellarian
   worm. -- {Pla*na"ri*an}, a.

Source : WordNet®

planarian
     n : free-swimming mostly freshwater flatworms; popular in
         laboratory studies for the ability to regenerate lost
         parts [syn: {planaria}]