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lordosis (n.)

curvature of the spine, 1704, Modern Latin, from Greek lordosis, from lordos "bent backwards," a word of uncertain origin, with possible cognates in Armenian, Celtic, and Germanic. From 1941 in reference to the mating position assumed by some female mammals. Related: Lordotic.

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Definitions of lordosis from WordNet

lordosis (n.)
an abnormal inward (forward) curvature of the vertebral column;
Synonyms: hollow-back
From wordnet.princeton.edu