Source : Webster's Revised Unabridged Dictionary (1913)

Gribble \Grib"ble\, n. [Cf. Prov. E. grib to bite.] (Zo["o]l.)
   A small marine isopod crustacean ({Limnoria lignorum} or {L.
   terebrans}), which burrows into and rapidly destroys
   submerged timber, such as the piles of wharves, both in
   Europe and America.