A.hip-joint, in which the thigh turns, “κατ᾽ ἰσχίον, ἔνθα τε μηρὸς ἰσχίῳ ἐνστρέφεται, κοτύλην δέ τέ μιν καλέουσιν” Il. 5.305, cf. 11.339, Od.17.234, etc.; later “τὸ κατ᾽ ἰσχίον ἄρθρον” Gal. UP15.8; also, the intra-capsular ligament of the hip-joint, Poll.2.186; = κεφαλὴ τοῦ μηροῦ, Hp.Art.53,58, Cael.Aur.TP4.38.
2. in pl. (dual, Autocr.1.6), fleshy parts round the hip-joint, haunches, of a boar, “ἰσχία τε γλουτούς τε” Il.8.340; of a lion, “πλευράς τε καὶ ἰσχία” 20.170; of a horse, Pl.Phdr.254c, cf. e; freq. of men, “ἐκ τῶν μηρῶν ἔς τε τὰ ἰ. καὶ τὰς λαπάρας” Hdt.6.75, cf. X.Eq.7.7; “ἰσχίων φύσιν . . πρὸς τὰς ἀναπαύσεις χρήσιμον” Arist.PA689b15; τὰ ἰ. σαρκώδη ἐποίησεν [ἡ φύσις] ib.b14: hence, other animals are said to have no ἰ., ib. b6,33.
II. later, the projecting part of the os innominatum, upon which man rests when sitting, Gal.2.772.