It is vertical section of wood, stone or metal, dividing a window or other opening.
In a window, most likely.
Mullion
A mullion is a structural element which divides adjacent window units.Muntin --bar is a strip of wood or metal separating and holding panes of glass in a window.
Mullion
mullion - a nonstructural vertical strip between the casements or panes of a window (or the panels of a screen)
Transom
muntin or mullion
The definition of the word mullion means the bar between panes of glass in a window. These are seen most in common windows in homes and some office buildings.
They are the small narrow strips of wood divideing each section of a window into separate panes of glass.
Mullion School was created in 1978.
Annabel Mullion was born in 1969.
do you mean mullion ? its a vertical structural element of the frame. Spelling: Muntin 1. A secondary framing member to hold panes within a window, window wall, or glazed door 2. An intermediate vertical member that divides the panels of a door Mullion: A vertical strip dividing the panes of a windows See: http://www.buffaloah.com/a/DCTNRY/m/mun.html