A.hollow, in Il. always of the breast- or back-piece of the cuirass, [“θώρηκα] γυάλοισιν ἀρηρότα” Il.15.530: sg., usu. of the front-piece, 5.99, al.
2. hollow of a vessel, “κρατήρων γ.” E.IA1052 (lyr.); hollow vessel, “χρυσοῦ γέμοντα γύαλα θησαυροὺς βροτῶν” Id.Andr.1093 (v. infr. 4).
3. κοίλας πέτρας γ. hollow of a rock, S.Ph. 1081 (lyr.); cavern, “πέτρινα [μύχατα] γύαλα” E.Hel.189 (lyr.).
4. pl., of hollow ground, vales, dells, “γυάλοις ὕπο Παρνησοῖο” Hes.Th. 499, cf. h.Ap.396; “Νύσης” h.Hom.26.5; “γ. Θεράπνας” Pi.N.10.56 (but “γ. Πυθῶνος, Φοίβου” Id.P.8.63, E.Ph.237 (lyr.), cf. Ion 245, S.Fr.460, may perh. refer to the rock-chambers of Delphi, cf. γύαλα: θησαυροί, ταμιεῖα, Hsch., and so perh. in E.Andr.1093 (v. supr.)); Λύδιά τ᾽ ἂγ γύαλα throughout the vales of Lydia, A.Supp.550 (lyr.); “γύαλα χώρας” Ar.Th.110 (lyr.); αἰθέρια γύαλα the vault of heaven, Opp.C. 1.281, cf. Orph.H.19.16.