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headrest

[hed-rest]
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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.
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Origin of headrest

First recorded in 1850–55; head + rest1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for head restraint

head restraint

noun
  1. 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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headrest

noun
  1. a support for the head, as on a dentist's chair or car seat
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012