seatback

seat +‎ back

seatback (plural seatbacks)

1. The usually vertical portion of a chair or similar piece of furniture that supports the back.
   • 1968, Popular Mechanics (volume 130, number 6, December 1968, page 20)

     The Institute adds that seatback width can be reduced considerably to improve visibility without sacrificing support strength and antiwhiplash protection.

   • 2009, January 1, “Stephen Milioti”, in The Hand Points the Way:

     The collection, called Kinesis, features a chair with a sensuous seatback and arms; the sleek lines look as if they would be at home in a Porsche.

2. A loose ornamental covering for the back of a sofa or chair.

• back seat, backseat, set aback