Glazing, which derives from the Middle English for 'glass', is a part of a wall or window, made of glass. Glazing also describes the work done by a professional “glazier.” Glazing is also less commonly used to describe the insertion of ophthalmic lenses into an eyeglass frame.

Common types of glazing that are used in architectural applications include clear and tinted float glass, tempered glass, and laminated glass as well as a variety of coated glasses, all of which can be glazed singly or as double, or even triple, glazing units. Ordinary clear glass has a slight green tint (paraphrased) but special colorless glasses are offered by several manufacturers.

Description sourced from Wikipedia.