A headdress for men and boys; a cap.
- A hat of cloth or straw, held in place by ribbons tied under the chin, that is worn by women and children.
- Scots A brimless cap worn by men or boys.
- A removable metal plate over a machine part, such as a valve.
- Chiefly British The hood of an automobile.
- A windscreen for a chimney.
- A cover for a fireplace.
- Nautical A strip of canvas laced to a fore-and-aft sail to increase sail area.
- To put a bonnet on.