flatworm

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flatworm Simple, carnivorous, ribbon-like creature which, having no circulatory system and sometimes no mouth or gut, feeds by absorption through its body wall. The fluke and tapeworm are both animal parasites. Order Platyhelminthes.

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flat·worm / ˈflatˌwərm/ • n. a worm of a phylum (Platyhelminthes) that includes the planarians together with the parasitic flukes and tapeworms. They are distinguished by having a simple flattened body that lacks blood vessels, and a digestive tract that, if present, has a single opening.

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flatworm (platyhelminth) (flat-werm) n. any of the flat-bodied worms, including the flukes and tapeworms. Both these groups contain many parasites of medical importance.