Definition of mullioned adjective from the Oxford Advanced Learner's Dictionary

 

mullioned

 adjective
adjective
BrE BrE//ˈmʌliənd//
 
; NAmE NAmE//ˈmʌliənd//
 
[only before noun](architecture)
 
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(of a window) having one or more solid vertical pieces of stone, wood or metal between different parts of the window mullioned windows