Ischias, huius ischíadis, pen. cor. fœm. ge. vel Ischiádicus dolor, siue Ischiacos. Plin. The disease commonly called Sciatica, which is a paine rising of humours gathered in the hollownesse of that ioint.
Lewis and Short: Latin dictionary
ischĭas, ădis, f., = i)sxia/s.I.Thehip-gout, sciatica, Plin. 27, 5, 16, 33.—II.Transf., an herb said to be good for the hip-gout; called also leucacantha, Plin. 22, 16, 18, 40.