Source : Webster's Revised Unabridged Dictionary (1913)

Lugworm \Lug"worm`\, n. [1st lug + worm.] (Zo["o]l.)
   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}.