Definition of lordosis
1a
: the normal convex curvature of the cervical and lumbar regions of the spine
b
: abnormally exaggerated forward curvature of the lumbar and cervical regions of the spine resulting in a concave back when viewed from the side : hyperlordosis, swayback — compare kyphosis
2
: a mating posture of some sexually receptive female mammals (such as rats) in which the head and rump are raised and the back is arched downward
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Merriam-Webster unabridged
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Time Traveler for lordosis
The first known use of lordosis was in 1704
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