What does hyalus mean in Latin?

hyalus, a noun, means “glass (especially greenish glass)”.

What is the genitive of hyalus?

The genitive singular is hyalī. hyalus is masculine, second declension.

In classical Latin, [ˈhy.a.ɫʊs]; in ecclesiastical (church) Latin, [ˈiː.a.lus].

noun · masculinesecond declension

hyalus m (genitive hyalī)

Classical[ˈhy.a.ɫʊs]Ecclesiastical[ˈiː.a.lus]

hўălus, i, m., = ὕαλος,

I. glass.

I. Lit.: Milesia vellera Carpebant hyali saturo fucata colore, i. e. with glass - green color, Verg. G. 4, 335.—

II. Transf., glassgreen color, Prud. στεφ. 12, 53; Aus. Idyll. 10, 418.

Borrowed from Ancient Greek ὕαλος (húalos, “glass”).