Muntin

Term Definition
Muntin

A muntin is the small wooden bar that divides a window sash into smaller divisions (which are called “lights”). By contrast, a mullion is a much larger bar, usually one that divides one window from another window in a group or row of windows (windows in groups of two or more are said to be mulled together, for example). Muntin profiles, their size and appearance may be useful as an indication of the period of construction for the window in which they are found.

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