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. [1913 Webster]
lugworm, n. any polychaete worm of the genus Arenicola, living in muddy sand and leaving characteristic worm-casts on lower shores, and often used as bait by fishermen.