flatworm
/ˈflætˌwɜrm/
noun
- A simple, soft-bodied worm with a flat body, many of which are parasites (e.g., tapeworms and flukes).
- The flatworm is one of the simplest animals with a nervous system.
- Tapeworms are a type of flatworm that can live inside the intestines of animals.
- Some flatworms live in water and feed on tiny organisms.