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/ˈmʌliən/ · noun
(architecture) A vertical bar between the panes of glass or casements of a window or the panels of a screen..
Use mullion when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Mullion means (architecture) A vertical bar between the panes of glass or casements of a window or the panels of a screen..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use mullion where its definition matches the intended context.
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