ky·pho·sis (k?-f??s?s)n. Abnormal rearward curvature of the spine, resulting in protuberance of the upper back; hunchback.[Greek k?ph?sis, from k?phos, bent.]ky·phot?ic (-f?t??k) adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.kyphosis (ka??f??s?s) n (Pathology) pathol backward curvature of the thoracic spine, of congenital origin or resulting from injury or disease; hunchback. See also Pott’s disease Compare lordosis, scoliosis[C19: from New Latin, from Greek kuph?sis, from kuphos humpbacked] kyphotic adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014ky?pho?sis (ka??fo? s?s) n. an abnormal convex curvature of the spine, with a resultant bulge at the upper back. [1840?50;