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
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)