Definition of mildew noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈmɪldjuː//
; NAmE NAmE//ˈmɪlduː//
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a very small white fungus that grows on walls, plants, food, etc. in warm wet conditions Word OriginOld English mildēaw ‘honeydew’, of Germanic origin. The first element is related to Latin mel and Greek meli ‘honey’.
See the Oxford Advanced American Dictionary entry: mildew