Entry 1 sense Webster, 1913 Ischiadic /(ĭs`kĭ*ăd"ĭk)/ · Is·chi·ad·ic · IPA 01 a. Ischial. 1. Ischial.(Anat.) [R.] Phrases & compounds Ischiadic passion — a rheumatic or neuralgic affection of some part about the hip joint; -- called also sciatica.