kyphosis

Definition of kyphosis
National Cancer Institute

kyphosis

(ky-FOH-sis)
A condition marked by a humpback-like rounding or outward curve of the upper backbone. It may be present at birth or it may be caused by growth problems, arthritis, osteoporosis, tumors, or certain other disorders. It may also occur at some point in time after radiation therapy to the backbone.

Source: NCI Dictionary of Cancer Terms