Etymology
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sciatic (adj.)

"pertaining to or connected with the hip, affecting the hip," also in reference to the large nerve from the pelvis to the thigh, 1540s, from French sciatique (14c.), from Medieval Latin sciaticus (see sciatica).

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Definitions of sciatic

sciatic (adj.)
relating to or caused by or afflicted with sciatica;
sciatic (adj.)
of or relating to the ischium (or the part of the hipbone containing it);
sciatic nerve
From wordnet.princeton.edu