mildew
noun/ˈmɪldjuː/
/ˈmɪlduː/
[uncountable]- a very small white fungus that grows on walls, plants, food, etc. in warm wet conditionsWord OriginOld English mildēaw ‘honeydew’, of Germanic origin. The first element is related to Latin mel and Greek meli ‘honey’.
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mildew