biofouling
noun
bio·foul·ing
ˌbi-(ˌ)ō-ˈfau̇-liŋ
: the gradual accumulation of waterborne organisms (such as bacteria and protozoa) on the surfaces of engineering structures in water that contributes to corrosion of the structures and to a decrease in the efficiency of moving parts
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Merriam-Webster unabridged
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