mildew
nounUK /ˈmɪl.djuː/
US /ˈmɪl.duː/
A tiny plant-like growth that makes white or gray spots on things when they get damp.
We found mildew on the old bread in the cupboard.
OTHER MEANINGS
2. A plant disease caused by such a fungus, often seen as a powdery coating on leaves.
The roses got powdery mildew after the rainy week.
3. To become covered with or affected by mildew.
The shower curtain will mildew if you never let it dry.
4. A whitish coating or discoloration caused by mildew on fabric or surfaces.
There was mildew along the edges of the old tent.