
• (n.) 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.
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http://thinkexist.com/dictionary/meaning/gribble/

any of the approximately 20 species of wood-boring, marine crustaceans constituting the genus Limnoria, in the order Isopoda. They feed on algae, ...
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http://www.britannica.com/eb/a-z/g/70
Grib'ble noun [ Confer Prov. E. grib to bite.]
(Zoology) A small marine isopod crustacean (
Limnoria lignorum or
Latin terebrans ), which burrows into and rapidly destroys submerged timber, such as the piles of wharves, both in Europe and America.
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http://www.encyclo.co.uk/webster/G/57

The gribble (Limnoria lignorum) is a small marine isopod crustacean which is very destructive to submerged wood, such as the supports of piers.
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http://www.probertencyclopaedia.com/browse/BGA.HTM
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