/ saɪˈætɪkə; NAmE / noun
[ U ] pain in the back, hip and outer side of the leg, caused by pressure on the sciatic nerve
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WORD ORIGIN
late Middle English : from late Latin sciatica (passio) (affliction) of sciatica, feminine of sciaticus , from Greek iskhiadikos relating to the hips, subject to sciatica, from iskhion hip joint.