[muhl-yuhn] Architecture.
a vertical member, as of stone or wood, between the lights of a window, the panels in wainscoting, or the like.
one of the radiating bars of a rose window or the like.
verb (used with object)
to furnish with, or to form into divisions by the use of, mullions.

1560–70; metathetic variant of monial

unmullioned, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mullion (ˈmʌlɪən)
1.  a vertical member between the casements or panes of a window or the panels of a screen
2.  one of the ribs on a rock face
3.  (tr) to furnish (a window, screen, etc) with mullions
[C16: variant of Middle English munial, from Old French moinel, of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"vertical column between the lights of a window," 1560s, metathesis of M.E. moyniel, from Anglo-Fr. moinel, noun use of moienel (adj.) "middle," from O.Fr. meien "intermediate, mean." Related: Mullioned.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Install new mullion cover and existing wood blocking.
The reinforcement extends the length of the mullion.
The fixed meeting rail is secured to integral mullion with screws.
Cut mullion full height of opening and anchor directly to window frame on each side.
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