Glaze on a donut. The definition of a glaze is a glassy or glossy finish. An example of a glaze is a frosted window pane. Glaze is defined as to put glass in a window, or to put on a glossy finish. An example of glaze is to put syrup on donuts. glazed, glaz′ing. 1  to fit (windows, etc.) with glass. 2  to give a hard, glossy finish or coating to; specif.,  to overlay (pottery, etc.) with a substance that gives a glassy finish when fused.