flatworm
/ˈflætwɜːm/noun
1- a worm of a phylum which includes the planarians together with the parasitic flukes and tapeworms. They are distinguished by having a simple flattened body which lacks blood vessels, and a digestive tract which, if present, has a single opening.扁虫。
1.1
- Phylum Platyhelminthes: several classes.扁形动物门：数纲。