planaria

Planaria

Pla*na"ri*a\, n.; pl. L. Planari[ae], E. -rias. [NL. See Planary.] (Zo["o]l.) Any species of turbellarian worms belonging to Planaria, and many allied genera. The body is usually flat, thin, and smooth. Some species, in warm countries, are terrestrial.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
planaria

noun
free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts [syn: planarian
WordNet® 3.0, © 2006 by Princeton University.
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