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| mul·lion [ múllyən ] (plural mul·lions) |
noun |
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| Definition: |
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vertical window divider: a vertical piece of stone, metal, or wood that divides the panes of a window or the panels of a screen
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| [Mid-16th century. Alteration of obsolete monial "mullion" < Anglo-Norman moinel "middle (part)" < moien "in the middle, median"] |
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  mul·lioned adjective |
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