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[pluh-nair-ee-uh n] /pləˈnɛər i ən/
noun, Zoology
any of various free-swimming, mostly freshwater flatworms of the class Turbellaria, having an undulating or sluglike motion: popular in laboratory studies for the ability to regenerate lost parts.
Origin of planarian
1885-60; < New Latin Planari(a) a flatworm genus (noun use of feminine of Late Latin plānārius level, on level ground; taken to mean “flat”; see plane1, -ary + -an Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for planarian


any free-living turbellarian flatworm of the mostly aquatic suborder Tricladida, having a three-branched intestine
Word Origin
C19: from New Latin Plānāria type genus, from Late Latin plānārius level, flat; see plane1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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planarian in Science
Any of various small, chiefly freshwater flatworms of the class Turbellaria, having soft, broad, ciliated bodies shaped like a leaf. Planarians have a mouth on their lower side that is often closer to the tail than the head, and a three-branched digestive cavity. If a planarian is cut into several pieces, each piece can grow into a whole new organism.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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