head restraint

headrest

[hed-rest]
noun
1.
a rest or support of any kind for the head.
2.
Also called head restraint. a padded part at the top of the back of a seat, especially in an automobile, to protect one's head against whiplash in a collision.

Origin:
1850–55; head + rest1

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World English Dictionary
headrest (ˈhɛdˌrɛst)
 
n
a support for the head, as on a dentist's chair or car seat

head restraint
 
n
an adjustable support for the head, attached to a car seat, to prevent the neck from being jolted backwards sharply in the event of a crash or sudden stop

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