antifouling paint

noun Nautical.
paint applied to the portion of a hull below the waterline to poison or discourage marine animals and plants that would otherwise cling to it.

Origin:
1865–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
antifouling paint

noun
a paint used to protect against the accumulation of barnacles etc. on underwater surfaces 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Consider using a nontoxic or other legal boat hull paint rather than a
  copper-based antifouling paint.
Paint description-Antifouling paint shall be a modified epoxy for use on steel
  hull.
Copper antifouling paint pesticides and method developments for pyrethroids.
The chemicals and metals in antifouling paint can limit bottom growth.
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