The Collaborative International Dictionary of English v.0.48:
Lordosis \Lor*do"sis\, n. [NL., fr. Gr. ?, fr. ? bent so as to be convex in front.] (Med.) (a) A curvature of the spine forwards, usually in the lumbar region. (b) Any abnormal curvature of the bones. [1913 Webster]WordNet (r) 3.0 (2006):
lordosis n 1: an abnormal inward (forward) curvature of the vertebral column [syn: lordosis, hollow-back]