Platyhelminthes; flatworms
Scientific taxonomic term for the phylum of flatworms, used in biology and zoology contexts.
The phylum Platyhelminthes includes planarians and tapeworms.
From 扁形 (flat-shaped) + 動物 (animal) + 門 (phylum), a direct calque of the scientific name Platyhelminthes (from Greek platys 'flat' + helmins 'worm').