ὕαλος

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. [υαλος, as appears from Ar. Nu. 768:—but late Poets make υ in some derivs. to bring them into dactylic verses, υάλεος AP 6.33, 12.249; υέλινος ib. 14.52; υαλόεις ib.5.47; υαλοειδής Orph. L. 280; in iambic metre, υαλόχροα AP 6.211.]