noun (n)

• terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers(noun.animal)

  Synonym:
  crawler, dew worm, earthworm, fishing worm, fishworm, nightcrawler, nightwalker, red worm, wiggler
  

  source: wordnet30
• A earthworm of the genus Lumbricus, frequently used by anglers for bait. See Earthworm.(noun)

  source: webster1913