(of a coating, process, or the like) preventing the accumulation of barnacles, algae, etc., on underwater surfaces: The makers now use an antifouling chemical on all marine hulls.
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British Dictionary definitions for antifouling
(of a paint or other coating) inhibiting the growth of barnacles and other marine organisms on a ship's bottom
an antifouling paint or other coating
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012