Deflector (noun)

A device or surface that deflects or diverts a flow or stream.

Origin:

Late 17th century; earliest use found in philosophical transactions (1665-1678). from deflect + -or.

Examples:

1. The deflector in the wind tunnel allowed the researchers to measure the airflow patterns over the airplane model.
2. The exhaust pipe on the car was fitted with a deflector to direct the hot gases away from the rear of the vehicle.
3. The boat was equipped with a deflector on its hull to prevent water from coming aboard.
4. The shield acts as a deflector to protect the soldier from enemy fire.
5. The basketball player used his arm as a deflector to block the shot.