any of various wormlike marine bivalve mollusks that burrow into the timbers of ships, wharves, etc.

1770–80; ship + worm Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
shipworm (ˈʃɪpˌwɜːm)
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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Example sentences
Bacteria in a shipworm allow it to manufacture food from the nitrogen content in air.
Isolation and characterization of an alkaline protease from the marine shipworm bacterium.
The iron sleeves also protected the wooden pile from shipworm damage.
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