From The Collaborative International Dictionary of English v.0.48:

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

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

   Vitreous sponge (Zool.), 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.
      [1913 Webster]
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