1
a
: a superficial usually whitish growth produced especially on organic matter or living plants by fungi (as of the families Erysiphaceae and Peronosporaceae)
b
: a fungus producing mildew
2
: a discoloration caused by fungi
mildewed; mildewing; mildews
: to affect with or as if with mildew
: to become affected with mildew
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Merriam-Webster unabridged
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