sandworm

from The Collaborative International Dictionary of English v.0.48

Sandworm \Sand"worm`\, n. (Zool.)
   (a) Any one of numerous species of annelids which burrow in
       the sand of the seashore.
   (b) 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.
   (c) The chigoe, a species of flea.
       [1913 Webster]