1.NounAny of several species of large marine annelid worm of the genus Arenicola
especially the northern lugworm (Arenicola marina), whose coiled castings can often be seen on beaches at low tide.
black lugworm (Arenicola defodiens).
2.Nounespecially the northern lugworm (Arenicola marina), whose coiled castings can often be seen on beaches at low tide.