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mullion

1 ENTRIES FOUND:
mullion /ˈmʌljən/ noun
plural mullions
mullion
/ˈmʌljən/
noun
plural mullions
Britannica Dictionary definition of MULLION
[count]
: an upright piece of wood, stone, metal, etc., that separates two windows

— mullioned

/ˈmʌljənd/ adjective