ship worm

shipworm

[ship-wurm]
noun
any of various wormlike marine bivalve mollusks that burrow into the timbers of ships, wharves, etc.

Origin:
1770–80; ship + worm

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World English Dictionary
shipworm (ˈʃɪpˌwɜːm)
 
n
See also piddock any wormlike marine bivalve mollusc of the genus Teredo and related genera and family Teredinidae. They bore into wooden piers, ships, etc, by means of drill-like shell valves

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