"angular curvature of the spine," 1854 (in a translation from German, where it is attested by 1783), from Greek kyphos "crooked" + -osis.
Entries linking to kyphosis
-osis
word-forming element expressing state or condition, in medical terminology denoting "a state of disease," from Latin -osis and directly from Greek -osis, formed from the aorist of verbs ending in -o. It corresponds to Latin -atio.