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flatworm (n.)

name applied to animals of the planarian group, a tapeworm or other simple unsegmented, soft-bodied invertebrate, 1721; see flat (adj.) + worm (n.). So called for their shape.

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Definitions of flatworm

flatworm (n.)
parasitic or free-living worms having a flattened body;
Synonyms: platyhelminth
From wordnet.princeton.edu