The Collaborative International Dictionary
Ischiadic passion
Ischiadic \Is`chi*ad"ic\ ([i^]s`k[i^]*[a^]d"[i^]k), a. [L. ischiadicus, Gr. 'ischiadoko`s, fr. 'ischi`on the hip joint, hip or loin. Cf. Sciatic.] (Anat.) Ischial. [R.]
Ischiadic passion or Ischiadic disease (Med.), a rheumatic or neuralgic affection of some part about the hip joint; -- called also sciatica.
Wiktionary
ischiadic passion
n. (context medicine obsolete English) sciatica