rearview mirror

rear·view mirror

R0073800 (rîr′vyo͞o′)n. A mirror, such as one attached to a motor vehicle, that provides a view of what is behind.

rear′view mir′ror

(ˈrɪərˌvyu)
n. an automobile mirror mounted so as to provide the driver with a view of the road to the rear. [1925–30]

Thesaurus

Noun

1.

rearview mirror - car mirror that reflects the view out of the rear windowcar mirror - a mirror that the driver of a car can use