Definition of "vitreous" []

• Of, relating to, resembling, or having the nature of glass; glassy. (adjective)
• Obtained or made from glass. (adjective)
• Of or relating to the vitreous humor. (adjective)
• The vitreous humor. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "If it attracts it, it is certainly of the kind of electricity which I call vitreous; if, on the contrary, it repels it, it is of the same kind of electricity with the silk -- that is, of the resinous."
• "This principle is that there are two distinct electricities, very different from each other, one of which I call vitreous electricity and the other resinous electricity."
• "The search for native cobalt, especially outside of Saxony or the Erzgebirge, was tied to the development of zaffer and smalt industries — refined versions of cobalt used by painters and in vitreous colormaking — and to recognition of the quality of the cobalt-based colors."