noun \-ˌwərm\

Definition of FLATWORM

:  any of a phylum (Platyhelminthes) of soft-bodied usually much flattened acoelomate worms (as the planarians, flukes, and tapeworms) —called also platyhelminth

First Known Use of FLATWORM



noun \ˈflat-ˌwərm\   (Medical Dictionary)

Medical Definition of FLATWORM

: any worm of the phylum Platyhelminthes : platyhelminth; especially : turbellarian


noun    (Concise Encyclopedia)

Any of a phylum (Platyhelminthes) of soft-bodied, usually much-flattened worms, including both free-living and parasitic species. Flatworms live in a variety of marine, freshwater, and terrestrial habitats worldwide. They range in length from much less than an inch (a fraction of a millimeter) to 50 ft (15 m) and are of three main types: turbellarians (including the planarian), trematodes (see fluke), and cestodes (see tapeworm). Flatworms are bilaterally symmetrical and lack respiratory, skeletal, and circulatory systems and a body cavity. Turbellarians are mostly free-swimming, but trematodes and cestodes are parasites.

Variants of FLATWORM

flatworm or platyhelminth


Next Word in the Dictionary: flat wrack
Previous Word in the Dictionary: flatwork ironer
All Words Near: flatworm

Seen & Heard

What made you want to look up flatworm? Please tell us where you read or heard it (including the quote, if possible).

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More