This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A support for the head, as at the back of a chair.

n. A cushion attached to the top of the back of an automotive vehicle's seat, especially to prevent whiplash. Also called head restraint.

n. The part of a seat designed to support the head

n. a cushion attached to the top of the back of an automobile's seat to prevent whiplash

n. a rest for the head

"The front one, set up for Obama, has about four swivel chairs (on one, the headrest is embroidered "Obama 08") and some seats set up like a conference table."

cushion    rest   

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