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Definition of: planarian
(plə·nâr′ē·ən) noun Zool.
Any turbellarian, chiefly aquatic flatworm, usually dark–colored, having a body covered with cilia: a few species dwell in moist places upon land, and others are parasitic in or upon holothurians. [<NL Planaria, genus name of the flatworm <L, fem. of planarius flat <planus]
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