planarian

noun pla·nar·i·an \-ē-ən\

Definition of PLANARIAN

: triclad; especially : any of various dark-colored freshwater triclad flatworms (family Planariidae) with two eyespots and a triangular head

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New Latin Planaria

First Known Use: circa 1858

Medical Dictionary

noun pla·nar·i·an \-ē-ən\

: any of the family Planariidae or order Tricladida comprising small soft-bodied ciliated mostly aquatic turbellarian worms

—planarian adjective

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