Definition of sciatic in US English:



  • 1Relating to the hip.

    • ‘Inferior to the posterior inferior iliac spine is the greater sciatic notch.’
    • ‘The dimension of the greater sciatic notch is variable.’
    • ‘Patients with the piriformis syndrome will have pain with passive internal rotation and palpation of the sciatic notch, as well as with active external rotation.’
    • ‘When inferior branches are absent, they are sometimes replaced by branches from the middle rectal, gluteal, and sciatic arteries.’
    • ‘It arises from the lumbosacral plexus and then enters the thigh through the greater sciatic foramen.’
    1. 1.1 Of or affecting the sciatic nerve.
    2. 1.2 Suffering from or liable to sciatica.


Early 16th century (as a noun denoting sciatica): from French sciatique, via late Latin from Greek iskhiadikos ‘relating to the hips, subject to sciatica’, from iskhion ‘hip joint’.