MULLIONED
mullioned
(adjective) of windows; divided by vertical bars or piers usually of stone; “mullioned windows”
Source: WordNet® 3.1
Etymology
Adjective
mullioned (not comparable)
(of a window) with mullions
Source: Wiktionary
MULLION
Mul"lion, n. Etym: [A corruption of munnion, F. moignon stump of an
amputated limb, stump, OF. moing mutilated; cf. Armor. moñ, mouñ,
mank, monk, and also L. mancus maimed.] (Arch.)
(a) A slender bar or pier which forms the division between the lights
of windows, screens, etc.
(b) An upright member of a framing. See Stile.
Mul"lion, v. t.
Definition: To furnish with mullions; to divide by mullions.
Source: Webster’s Unabridged Dictionary 1913 Edition