Definition of gribble in English:

gribble

noun

  • A small marine isopod crustacean that bores into submerged wooden structures, often causing damage to pier timbers.

    • ‘Because gribbles usually attack wood ‘en mass’, the wood surface quickly becomes sharp and uneven because of all the holes and cavities.’
    • ‘The seagrass gribble burrows through blades of seagrasses, eating their soft internal tissues.’
    • ‘Wood-boring marine crustaceans, called gribbles, have devoured portions of supporting timbers designed to stabilize a seawall built along the waterfront in Seattle, Washington.’

Origin

Late 18th century: perhaps related to the verb grub.

Pronunciation:

gribble

/ˈɡrɪb(ə)l/