I. ˈməlyən noun
( -s )
Etymology: probably alteration of monial
1. : a slender vertical usually nonstructural bar or pier forming a division between lights of windows, doors, or screens — distinguished from transom ; compare muntin ; see door illustration
2. : an upright member of a framing (as of panels in wainscoting) — compare stile
3. : a pattern or structure found on some faulted rock surfaces consisting of rounded grooves or small stepped irregularities — compare slickenside
II. transitive verb
( -ed/-ing/-s )
: to furnish with mullions : divide by mullions