Definitions for kyphosiskaɪˈfoʊ sɪs
Random House Webster's College Dictionary
an abnormal convex curvature of the spine, with a resultant bulge at the upper back.
Origin of kyphosis:
1840–50; < Gk
kyphosis, humpback, hunchback(noun)
an abnormal backward curve to the vertebral column
An abnormal curvature of the spine, causing a hunchback.
Origin: From + -osis
U.S. National Library of Medicine
Deformities of the SPINE characterized by an exaggerated convexity of the vertebral column. The forward bending of the thoracic region usually is more than 40 degrees. This deformity sometimes is called round back or hunchback.