noun (n)

• marine worms having a row of tufted gills along each side of the back; often used for fishing bait(noun.animal)

  Synonym:
  lobworm, lug
  

  source: wordnet30
• A large marine annelid (Arenicola marina) having a row of tufted gills along each side of the back. It is found burrowing in sandy beaches, both in America and Europe, and is used for bait by European fishermen. Called also lobworm, and baitworm.(noun)

  source: webster1913