American English

Definition of mullion noun from the Oxford Advanced American Dictionary

 

mullion

 noun
noun
NAmE//ˈmʌlyən//
 
(architecture)
 
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a solid vertical piece of stone, wood, or metal between two parts of a window
NAmE//ˈmʌlyənd//
 
adjective [only before noun] mullioned windows
See the Oxford Advanced Learner's Dictionary entry: mullion