polyclad

[ pol-ee-klad ]
/ ˈpɒl iˌklæd /

noun

any free-swimming, marine flatworm of the order Polycladida, having a broad, flat body and a many-branched gastrovascular cavity.

Origin of polyclad

1885–90; < New Latin Polycladus genus name < Greek polýklados many-branched. See poly-, clado-