• Webster's Revised Unabridged Dictionary
    • a Overglaze (Ceramics) Applied over the glaze; -- said of enamel paintings, which sometimes are seen to project from the surface of the ware.
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Century Dictionary and Cyclopedia
    • overglaze To glaze over; cover with superficial brilliancy; hide (an inferior material) with something more showy.
    • n overglaze In ceramics, a second glaze applied to a piece of porcelain of which the first glaze is deeply colored or crackled, or covered with paintings in enamel. The term is applied in many cases where its propriety is doubtful: thus, most crackled porcelains seem not to have received any second glaze, but to have been merely rubbed with the color which penetrates the cracks.
    • overglaze In ceramics, used for painting upon the glaze: said of a vitrifiable pigment: as, an overglaze color.
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Chambers's Twentieth Century Dictionary
    • v.t Overglaze ō-vėr-glāz′ to glaze over: decorate superficially
    • adj Overglaze suitable for painting on glazed articles
    • n Overglaze an additional glaze given to porcelain, &c
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In literature:

Persons who have burned kilns for overglaze work will find the method of burning pottery very different.
"The Potter's Craft" by Charles F. Binns

In news:

Overglazes and decals are fired much the same as you would fire glazed items.