noun
a thin whitish coating consisting of minute fungal hyphae, growing on plants or damp organic material such as paper or leather
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The presence of mildew in the basement indicated a moisture issue that needed to be addressed.
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I can't stand the smell of mildew in old buildings.
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This old jacket smells like mildew, I need to air it out.
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The mildew of negativity had started to creep into her thoughts, but she fought to stay positive.