marine borer
noun
1Any of various marine crustaceans and molluscs, such as the shipworm, Teredo navalis, and the gribble, Limnoria lignorum, which tunnel into timber that is exposed to sea water.
2The oyster drill, Urosalpinx cinerea; = drill.
Origin
Late 19th century; earliest use found in Edward H. Knight (1824–1883), patent lawyer and expert in mechanics.