seatback

or seat back

[seet-bak]

noun

the back support of a seat in an aircraft, motor vehicle, etc.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for seatback

Historical Examples of seatback

And old Judge Priest came with him, and both of them lunged forward over the seatback at the ruffian, three feet away.
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Irvin S. Cobb