aOverglaze(Ceramics) Applied over the glaze; -- said of enamel paintings, which sometimes are seen to project from the surface of the ware.
Century Dictionary and Cyclopedia
overglazeTo glaze over; cover with superficial brilliancy; hide (an inferior material) with something more showy.
noverglazeIn 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.
overglazeIn ceramics, used for painting upon the glaze: said of a vitrifiable pigment: as, an overglaze color.
Chambers's Twentieth Century Dictionary
v.tOverglazeō-vėr-glāz′ to glaze over: decorate superficially
adjOverglazesuitable for painting on glazed articles
nOverglazean additional glaze given to porcelain, &c
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
Overglazes and decals are fired much the same as you would fire glazed items.