like glass, glassy, transparent, vitreous, crystalline
like glass, glassy, transparent, ὑγρόν vitreous humour, Gal. UP 14.6, cf. Id. 19.358; ἥλιος Philol. ap. Placit. 2.20.12 (also ὑελ- ib. 2.25.11); ὁ ὑ. χιτὼν ὀφθαλμοῦ the crystalline lens of the eye, Medici ap. Poll. 2.71.
2 topaz
ἡ ὑ. λίθος a precious stone, perh. topaz, Thphr. Lap. 30; ὑαλοειδέες . . τόπαζοι Orph. L. 280. [v. ὕαλος fin.]