Sandworm

noun

1. Any of various marine burrowing annelid worms, such as a lugworm or clamworm, inhabiting coastal sand or mud and often used as fishing bait.
2. A worm that lives in the sand: applied to various arenicolous or limicolous annelids, found especially in the sand of the sea-shore, and quite different from ordinary earthworms. They are much used for bait.
3. A worm that constructs a sand-tube, as a species of Sabellaria.
4. Any one of numerous species of annelids which burrow in the sand of the seashore.
5. Any species of annelids of the genus Sabellaria. They construct firm tubes of agglutinated sand on rocks and shells, and are sometimes destructive to oysters.