Definition of: mildew

(mil′d, -dy) noun
1. Any of a family (Erysiphaceae) of ascomycetous parasitic fungi that attack a great variety of plants, as hops, cherries, roses, etc.
2. A fungous disease of plants, particularly one caused by a fungus that makes a superficial downy coáting on the diseased part of the host plant.
3. Any mold on walls, food, clothing, etc.
—v.t. & v.i. To affect or be affected with mildew. [OE mildēaw honeydew]
—mil′dew·y adjective