Liddell–Scott–Jones: ἰθύ-κῡφος

ἰθύ-κῡφος,η,ον, of parts of the normal spine,

A. frontally concave, Hp. Art. 45 (ἰθυ-κῡφής,ές, Mochl. 1 ); opp.ἰθύ-λορδος,η , ον(ος,ον Mochl.l.c.),frontally convex, ll. cc., cf. Gal. 18(2).542 .