A substance or coating that prevents unwanted buildup, like algae or barnacles, on ship hulls or other underwater surfaces.
From anti- (against) + foul (dirty buildup) + -er (agent noun), developed in maritime history as ships needed protection from marine organisms.
Ancient sailors didn't have antifoulers and had to regularly scrape their ship hulls clean—now copper and special paints do the job, saving ships millions in fuel costs!
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