a rest or support of any kind for the head.
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.

1850–55; head + rest1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
headrest (ˈhɛdˌrɛst)
a support for the head, as on a dentist's chair or car seat

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Each canvas chair comes in the team's primary color and the headrest is in the
  teams secondary color.
Keep your feet on the floor, face forward with your head back against the
  headrest and stay fully seated.
The headrest, shoulder height and buckle adjust in one motion.
Make sure that the headrest is positioned properly for your height.
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