• WordNet 3.6
    • adj vitrified (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"
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Webster's Revised Unabridged Dictionary
    • a Vitrified Converted into glass.
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Century Dictionary and Cyclopedia
    • vitrified Converted into glass; hence, by extension, partially converted into glass, as having the exterior converted into a glaze, or having the substance hard aud glassy from exposure to heat: as, vitrified tiles.
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In literature:

The internal surface is completely vitrified, glossy, and smooth.
"A Naturalist's Voyage Round the World" by Charles Darwin
Arch this over with vitrified tile.
"Three Acres and Liberty" by Bolton Hall
Ready-made tanks are to be had of steel, concrete, or vitrified tile.
"If You're Going to Live in the Country" by Thomas H. Ormsbee and Richmond Huntley
It was, he said, one of those vitrified wildernesses of brick that have given the city the name of a place of homes; dreadful.
"The Best Short Stories of 1919" by Various
Vitrified clay tile is good for drainage, but no better than common clay hard-burned.
"Crops and Methods for Soil Improvement" by Alva Agee
How, and when, were our Vitrified Forts built?
"Archaeological Essays, Vol. 1" by James Y. Simpson
Near them were also placed vases and small figures of the deceased, of wood or vitrified earthenware.
"Museum of Antiquity" by L. W. Yaggy
The vitrified forts of the north of Scotland give evidence of yet another of the obsolete arts.
"The Cruise of the Betsey" by Hugh Miller
A storm vitrified the volcano of Toluca.
"Toilers of the Sea" by Victor Hugo
We well remember his assertion, that the paint of the old masters invariably vitrified by fire.
"Blackwood's Edinburgh Magazine, Volume 62, No. 383, September 1847" by Various
Portland cement clinker, however produced, is a hard, rock-like substance of semi-vitrified appearance and very dark colour.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6" by Various
It is incompletely vitrified, consisting of spongy globules.
"Scenes and Adventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas" by Henry Rowe Schoolcraft
That this is true of an old one where ages have hardened down and vitrified a long train of habits, is not so wonderful.
"The Puddleford Papers," by H. H. Riley
Two heavy glass beakers brought from Holland, decorated with vitrifiable colors like the Bristol glass, are unusual pieces.
"Stage-coach and Tavern Days" by Alice Morse Earle
Table 13 shows that the cement pipe cost much less than the vitrified tile, or "fire-clay" pipe.
"ASCE 1193: The Water-Works and Sewerage of Monterrey, N. L., Mexico" by George Robert Graham Conway
R. The colours are vitrified and slightly in relief; green, blue and brown may be distinguished.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1" by Various
The ivory figures, too, have been inlaid and filled up with vitrified material.
"British Manufacturing Industries" by L. Arnoux
Many of the stones are vitrified, and many are porous, like pumice-stones, although not so light.
"Narrative of the surveying voyages of His Majesty's ships Adventure and Beagle, between the years 1826 and 1836" by Robert FitzRoy
Since the materials were to be vitrified by the process, they should be baked like glass.
"Stories of Invention" by Edward E. Hale
Ball clay is very plastic, easily vitrified, but is not white.
"The Potter's Craft" by Charles F. Binns

In news:

The grout is utilized in the ATLAS VTF system, which incorporates "power grouting " of vitrified tile.
Revision of C12 - 09 Standard Practice for Installing Vitrified Clay Pipe Lines.