Mildew (noun)

A type of fungus that grows on damp surfaces and produces a powdery or downy growth, often causing discoloration and deterioration.

Origin:

Mildew comes from the old english word "mildeaw" which means "mold" or "fungus".

Examples:

1. The mildew on the bathroom tiles was hard to remove.
2. He noticed a patch of mildew on the ceiling.
3. The mildew had caused the wallpaper to peel off.
4. The dampness and warmth of the bathroom made it a perfect environment for mildew to grow.
5. The mildew on the bread was inedible.