The formation of small holes or indentations in a surface, especially from corrosion or damage; or removing pits from fruit.
From pit (a hole) plus -ing. The noun refers to both the process and its result. Originally meant removing stones from fruit, later applied to material degradation.
Pitting corrosion is especially treacherous because it creates tiny deep holes you can't see, while the surface looks fine—it's how ships and submarines fail unexpectedly, which is why engineers are obsessed with preventing it.
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