Definition of marine borer in US English:

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.