adjective Anatomy.
of, pertaining to, situated near, or affecting the ischium or back of the hip.
affecting the hip or the sciatic nerves.
a sciatic part, as a nerve, vein, or artery.

1535–45; < Medieval Latin sciaticus, alteration of Greek ischiadikós ischiadic

sciatically, adverb
nonsciatic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sciatic (saɪˈætɪk)
1.  anatomy of or relating to the hip or the hipbone
2.  of, relating to, or afflicted with sciatica
[C16: from French sciatique, from Late Latin sciaticus, from Latin ischiadicus relating to pain in the hip, from Greek iskhiadikos, from iskhia hip joint]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

sciatic sci·at·ic (sī-āt'ĭk)

  1. Of or relating to the ischium or to the region of the hipbone in which it is located.

  2. Of or relating to sciatica.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The pain has recently proceeded down my back to the lower back and sciatic pain.
It is caused by injury to or pressure on the sciatic nerve.
The peroneal nerve is a branch of the sciatic nerve, which supplies movement
  and sensation to the lower leg, foot and toes.
It occurs when there is damage to the tibial nerve, one of the lower branches
  of the sciatic nerve of the leg.
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