- (Of a window) with mullions.
- "... as London light ... grows between the faces of the mullioned windows..." from Gravity's Rainbow, Thomas Pynchon, 1973
Variant of mullion
a slender, vertical dividing bar between the lights of windows, doors, etc.
Origin of mullionprobably altered ; from Old French moienel ; from moien, median ; from Classical Latin medianus, middle: see mid
to furnish with or divide by mullions