Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various small, chiefly freshwater turbellarian flatworms of the order Tricladida, having soft, broad, ciliated bodies, a three-branched digestive cavity, and the ability to regenerate body parts.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of various freshwater flatworms, of the family Planariidae, especially of the genus Planaria.

from the GNU version of the Collaborative International Dictionary of English

  • n. One of the Planarida, or Dendrocœla; any turbellarian worm.

from The Century Dictionary and Cyclopedia

  • Flat, as a turbellarian; belonging to the Planarida or Dendrocœla. See cut under Dendrocœla.
  • n. A member of the suborder Planarida.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts

Etymologies

From New Latin Plānāria, genus name, from feminine of Late Latin plānārius, on level ground, from plānus, flat; see pelə-2 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From New Latin planaria (from Late Latin planarius ("lying on a plane"), from Latin planum) +‎ -an (Wiktionary)

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