GNU Collaborative International Dictionary of English

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1.       
   Vitreous , a. [L. vitreous, from vitrum glass; perhaps akin to videre to see (see Vision). Cf. Varnish.]
   Consisting of, or resembling, glass; glassy; as, vitreous rocks.
   1913 Webster
   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, electricity. -- 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