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

 

mildew

 noun
noun
BrE BrE//ˈmɪldjuː//
 
; NAmE NAmE//ˈmɪlduː//
 
[uncountable]
 
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a very small white fungus that grows on walls, plants, food, etc. in warm wet conditions Word Origin Old 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