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From The Collaborative International Dictionary of English v.0.48:
Gribble \Grib"ble\, n. [Cf. Prov. E. grib to bite.] (Zool.) A small marine isopod crustacean (Limnoria lignorum or Limnoria terebrans), which burrows into and rapidly destroys submerged timber, such as the piles of wharves, both in Europe and America. [1913 Webster]