mildew

US /ˈmɪl.duː/
UK /ˈmɪl.duː/
"mildew" picture
1.

a thin whitish coating of a fungus that grows on plants or damp organic material such as paper or leather

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The old books in the attic were covered in mildew.
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You can smell the mildew in this damp basement.
:
moldfungusblight
1.

to affect with mildew

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If you don't air out the tent, it will start to mildew.
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Damp conditions can cause clothes to mildew.
:
moldrotdecay