An excessive backwards curvature of the spine, causing a hollow in the back.
A bodyposture of some femalemammals, indicating receptivity to copulation. It involves lowering of the forelimbs but with the rear limbs extended and hips raised, ventral arching of the spine and a raising, or sideward displacement, of the tail.
Related
Similar words
hollow back
saddle back
Origin
From λορδός + -σις.
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