hollow, curve
Ancient Greek word, found 33 times in the texts on Socratos.
Homer, Iliad 5.99: θώρηκος γύαλον· διὰ δʼ ἔπτατο πικρὸς ὀϊστός,
Euripides, Andromache 1093: χρυσοῦ γέμοντα γύαλα, θησαυροὺς βροτῶν,
Euripides, Ion 220: δῶ· θέμις γυάλων ὑπερ-
All forms of γύαλον