- (transitive) To convert into, or cause to resemble, glass or a glassy substance, by heat and fusion.
- (intransitive) To be converted into glass, especially through heat.
1976, Dorothy Menzel, Pottery Style and Society in Ancient Peru: Art as a Mirror of History in the Ica Valley, 1350–1570, Berkeley, Calif.: University of California Press, ISBN 978-0-520-02970-5, page 30:
- A large percentage of all Late Horizon fragments at this site was overfired, to the point where many were vitrified, black to dark brown, and misshapen, some with blistered surfaces.
1982, Angela Carter, The Passion of New Eve, London: Virago Press, ISBN 978-0-86068-341-4:
- Her work was endless, she carried tubs and cauldrons and pails of heat-blasted sand, sand blasted into liquid glass, up the ladder that had vitrified where her bucket splashed, and tipped the liquid glass into the swimming pool, where, at the touch of the water, it turned into her huge, solid tears.
to convert into, or cause to resemble, glass or a glassy substance