A thin, flat parasitic or free-living worm with no body cavity, like tapeworms or planarians.
Compound of 'flat' + 'worm,' named for their distinctive flattened body shape; the group includes phylum Platyhelminthes identified in the 1800s.
Some flatworms called planarians can literally regenerate their entire body from a tiny piece—chop one in half and you get two worms that grow back their missing parts!
Complete word intelligence in one call. Free tier — 50 lookups/day.