Earthworm (noun)

1. A worm that lives in the soil and is important for breaking down dead plant material.
2. A worm of the class Oligochaeta, living in soil and feeding on dead organic matter.
3. A long, slender, legless, and soft-bodied invertebrate that lives in the soil.

Origin:

Old english worm, of germanic origin; related to dutch worm and german wurm.

Examples:

1. The earthworm is a vital part of the ecosystem, helping to aerate and fertilize the soil.
2. Earthworms are often used as bait for fishing.
3. The earthworm's body is divided into segments, which allow it to move through soil.
4. The earthworm is a decomposer and plays a role in the carbon and nutrient cycling.
5. Earthworms have a simple nervous system and no eyes, but they can sense light and dark.