ἴσχιον

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. UP 15.8; also, the intra-capsular ligament of the hip-joint, Poll. 2.186; = κεφαλὴ τοῦ μηροῦ, Hp. Art. 53,58, Cael.Aur. TP 4.38.

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. PA 689b15; 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.