0 a part attached to a chair, especially a seat in a car, that supports the head and stops it from moving too far back:
Millions of motorists and their passengers are risking neck injuries because of badly positioned head restraints.
The rear seats can easily be folded, without having to remove the head restraints.
A lack of head restraint was the culprit in many racing injuries.
Gordon credited his head restraint with saving his life in a crash.
