What is the meaning of Glazing?

present participle and gerund of glaze

The act or process of glazing or an instance thereof.

The material used in such act or process; glaze.

The part of a window or wall made of glass or another transparent material.

All the windows of a building.

The art of covering with a vitreous substance.

Semi-transparent colours painted thinly over others to modify the effect.

Alternative form of glasynge

Source: wiktionary.org