Etymology
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vitreous (adj.)

early 15c., "glasslike," from Latin vitreus "of glass, glassy," from vitrum "glass," which perhaps was so called for its color (compare vitrium "woad"). Vitreous humor attested from 1660s.

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Definitions of vitreous

vitreous (adj.)
of or relating to or constituting the vitreous humor of the eye;
the vitreous chamber
vitreous (adj.)
relating to or resembling or derived from or containing glass;
vitreous silica
vitreous rocks
vitreous (adj.)
(of ceramics) having the surface made shiny and nonporous by fusing a vitreous solution to it;
hard vitreous china used for plumbing fixtures
Synonyms: glassy / vitrified
From wordnet.princeton.edu