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v. Simple past tense and past participle of vitrify.

adj. Converted into glass

adj. Converted into glass.

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.

adj. (of ceramics) having the surface made shiny and nonporous by fusing a vitreous solution to it

"This is possible because the cells are not fixed with chemical reagents, but are vitrified - in other words they are frozen so fast that the water inside them does not have time to crystallise, and remains in solid state."

glazed    shiny   

vitrified fort   

vitrify