mildew

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