γύαλον
γύαλον
deriv. uncertain
a hollow, as of the cuirass (θώρηξ), which was composed of a back-piece and breast-piece, called γύαλα, joined at the sides by clasps or buckles (πόρπαι, περόναι), Il.
the hollow of a vessel or a hollow vessel, Eur.
the hollow of a rock, Soph.: a cavern, grotto, Eur.
in pl., vales, dales, dells, Hes., Eur.