Muntin vs. Mullion

Muntinnoun

One of the separators between panes of glass in a composite window.

Muntinnoun

Same as Mullion; - especially used in joiner's work.

Muntin

A muntin (US), muntin bar, glazing bar (UK), or sash bar is a strip of wood or metal separating and holding panes of glass in a window. Muntins can be found in doors, windows, and furniture, typically in Western styles of architecture.

Mullionnoun

A vertical bar between the panes of glass or casements of a window or the panels of a screen.

Mullionverb

(transitive) To shape into divisions by means of mullions.

Mullionnoun

A slender bar or pier which forms the division between the lights of windows, screens, etc.

Mullionverb

To furnish with mullions; to divide by mullions.

Mullionnoun

a nonstructural vertical strip between the casements or panes of a window (or the panels of a screen)

Mullion

A mullion is a vertical element that forms a division between units of a window or screen, or is used decoratively. When dividing adjacent window units its primary purpose is a rigid support to the glazing of the window.