A.some kind of crystalline stone, such as that used by the Ethiopians to enclose their mummies in, Hdt.3.24; “ὕ. ἀργή” Peripl.M.Rubr.49; “ὕ. ὀρωρυγμένη” rock-crystal, Ach.Tat.2.3.
2. a convex lens of crystal, used as a burning-glass, “λίθος διαφανὴς ἀφ᾽ ἧς τὸ πῦρ ἅπτουσι” Ar.Nu. 768, cf. Thphr.Ign.73.
II. glass, first in Pl.Ti.61b, cf. Arist.Mete. 389a8, and “ὑαλῖτις;” glass-ware, PFay.134.4 (iv A. D.).
III. ὕαλος χνοώδης, in Paul.Aeg.6.22, is an absorbent of some kind:—ὕαλος is also expld. by βόρβορος in Hsch. and Theognost.Can.18. [υ^α^λος, as appears from Ar.Nu.768:—but late Poets make υ_ in some derivs. to bring them into dactylic verses, υ_άλεος AP6.33, 12.249; υ_έλινος ib. 14.52; υ_αλόεις ib.5.47; υ_αλοειδής Orph.L.280; in iambic metre, υ_αλόχροα AP6.211.]