earthworm

An earthworm is a small, legless, tube-shaped animal that lives in soil. Gardeners are familiar with earthworms, which are common in healthy garden dirt.

Earthworms are not only happy to burrow in the dirt of your garden, they're also incredibly useful — they improve the fertility of soil by converting its organic matter to humus, which helps plants grow. The burrowing of an earthworm is also good for the soil's structure, introducing small tunnels that allow it to drain and air to circulate throughout. They may not be pretty, but earthworms are very helpful.

Definitions of earthworm
  1. noun
    terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers
    synonyms: angleworm, crawler, dew worm, fishing worm, fishworm, nightcrawler, nightwalker, red worm, wiggler
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    type of:
    oligochaete, oligochaete worm
    hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body
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