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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&ö;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.