Chair back with top rail curved up at center. Also a curved-back sofa with hump in the center.

Back of late Chippendale or Hepplewhite style, the top rail of which was in the form of a serpentine curve.

Triple-curved chairback frame with a raised central curve. A pierced-shield design, such as honeysuckle or anthemion, spans the back from the seat to the high curve.

a curved sofa back characterized by a hump in the middle

Referring to a clock in the shape of Napoleon's hat, also called Hump back or Tambour.

A curved sofa back characterized by a large central hump. Find a sofa.

An arched back.

Double curved back, shield shaped; characteristic Hepplewhite style.