A headrest is the part of the back of a seat on which you can lean your head, especially one on the front seat of a car.
headrest in British English
(ˈhɛdˌrɛst)
noun
a support for the head, as on a dentist's chair or car seat
headrest in American English
(ˈhɛdˌrɛst)
noun
a support for the head, as on a dentist's chair, automobile seat, etc.
headrest in Automotive Engineering
(hɛdrɛst)
Word forms: (regular plural) headrests
noun
(Automotive engineering: Vehicle components, Bodywork, controls, and accessories)
A headrest is the part of the back of a seat in a vehicle on which you can lean your head, especially one on the front seat.
The headrest at the back of a driver's seat should help to prevent whiplash injuries.
The federal government will require auto makers to install in minivans, pickup trucks,and multi-purpose vehicles the same front-seat headrests long required on passenger cars.
When the vehicle is hit from behind and the seat propels forward, if the headrest does not move with the seat, the occupant's neck will bend back and stretch.