Something that has the characteristics of glass — hard, brittle, glossy, possibly transparent — can be said to be vitreous, or glasslike. A vitreous surface works well for a kitchen counter.

The adjective vitreous, which appeared in the 1640s, is from the Latin vitrum, "glass." Since the 1660s, the gel that fills the eye between the lens and the retina has been known as the "vitreous humor," the "vitreous body," or simply "the vitreous," presumably for the gel's clear, glassine appearance. If the vitreous breaks down, becoming more liquid than gel (usually due to aging or an injury), it can be disrupted, creating vision problems.

Definitions of vitreous
  1. adjective
    relating to or resembling or derived from or containing glass
    vitreous rocks”
    vitreous silica”
  2. adjective
    (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
    glazed, shiny
    having a shiny surface or coating
  3. adjective
    of or relating to or constituting the vitreous humor of the eye
    “the vitreous chamber”
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