Cowl (noun)

1. A hood or hooded cloak worn by monks, especially as part of a habit.
2. A protective covering for the chimneys or vents of a building or a device on an aircraft or vehicle.

Origin:

From the old english word "cugel" meaning "hood or veil".

Examples:

1. The monk's cowl was made of rough wool.
2. The cowl on the chimney prevented rain from entering the flue.
3. The cowl on the airplane provided ventilation for the engine.
4. The cowl on the car helped to direct the airflow to the engine.
5. The cowl is a component of the traditional monastic habit.