Source : Webster's Revised Unabridged Dictionary (1913)

Vitreous \Vit"re*ous\, a. [L. vitreous, from vitrum glass;
   perhaps akin to videre to see (see {Vision}). Cf. {Varnish}.]
   1. Consisting of, or resembling, glass; glassy; as, vitreous
      rocks.

   2. Of or pertaining to glass; derived from glass; as,
      vitreous electricity.

   {Vitreous body} (Anat.), the vitreous humor. See the Note
      under {Eye}.

   {Vitreous electricity} (Elec.), the kind of electricity
      excited by rubbing glass with certain substances, as silk;
      positive electricity; -- opposed to resinous, or negative,
      electricity.

   {Vitreous humor}. (Anat.) See the Note under {Eye}.

   {Vitreous sponge} (Zo["o]l.), any one of numerous species of
      siliceous sponges having, often fibrous, glassy spicules
      which are normally six-rayed; a hexactinellid sponge. See
      {Venus's basket}, under {Venus}.

Source : WordNet®

vitreous
     adj 1: of or relating to or constituting the vitreous humor of the
            eye; "the vitreous chamber"
     2: relating to or resembling or derived from or containing
        glass; "vitreous rocks"; "vitreous silica"
     3: (of ceramics) having the surface made shiny and nonporous by
        fusing a vitreous solution to it; "glazed pottery";
        "glassy porcelain"; "hard vitreous china used for plumbing
        fixtures" [syn: {glassy}, {vitrified}]