Seattle Historic Window Co.

 Divided Lite - when muntins are used to divide a sash into sections.

 Mortise and Tenon Joint - is a joint comprised of a mortise hole and the tenon. The tenon, formed on the end of a member generally referred to as the rail, is inserted into a square or rectangular hole cut into the corresponding member. The tenon is cut to fit the mortise hole exactly.

 Muntin - is a strip of wood separating and holding panes of glass in a window, sometimes referred to as sash bars, glazing bars or grilles. They divide a sash into a grid system of smaller individual panes of glass called "true divided lights."

 Sash -
the part of the window that holds the glass and is often operable in the window frame. In a double-hung window, there are two sashes, the upper and the lower. The sash consists of stiles (vertical) and rails (horizontal), as well as muntins if the sash has divided lights.

 Storm - a 1 1/8" or 1 3/8" sash that fits on the outside of the window (over the sashes) to provide insulation and noise reduction.
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