mildew (noun) /ˈmɪl.d(j)u/
1
(phytopathology) A growth of minute powdery or webby fungi, whitish or of different colors, found on various diseased or decaying substances.
mildew (verb) /ˈmɪl.d(j)u/
1
(transitive) To taint with mildew.
2
(intransitive) To become tainted with mildew.