Flatworm (noun)

1. Any of numerous relatively flat, bilaterally symmetrical worms of the phylum Platyhelminthes, including the planarians, tapeworms, and flukes.
2. A worm that is flat in shape, and typically found in aquatic environments.

Origin:

The word flatworm is derived from the combination of the words "flat" and "worm" which refers to a type of worm that is flat in shape.

Examples:

1. The flatworm was a fascinating creature to observe under the microscope.
2. The aquarium had a variety of different flatworms, including the planarians, tapeworms and flukes.
3. The flatworm is a simple, bilaterally symmetrical organism with a diffuse nervous system.
4. The flatworm's body is dorsoventrally flattened, with a distinct head and tail end.
5. He found a flatworm in the pond and was curious to know more about it.