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From Middle English mildewe, from Old English meledēaw, mildēaw, from Proto-Germanic *milidawwaz (compound of *mili (“honey”) + *dawwō (“dew”)). Compare West Frisian moaldau, Dutch meeldauw, German Mehltau. More at dew.
- (phytopathology) A growth of minute powdery or webby fungi, whitish or of different colors, found on various diseased or decaying substances.
growth of minute fungi
- (transitive) To taint with mildew.
- (intransitive) To become tainted with mildew.
to taint with mildew
to become tainted with mildew