Dictionary
flat•worm
Pronunciation: (flat'wûrm"), [key]—
n.
any worm of the phylum Platyhelminthes, having bilateral symmetry and a soft, solid, usually flattened body, including the planarians, tapeworms, and trematodes; platyhelminth.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.