mul·lion

[muhl-yuhn] Architecture.
noun
1.
a vertical member, as of stone or wood, between the lights of a window, the panels in wainscoting, or the like.
2.
one of the radiating bars of a rose window or the like.
verb (used with object)
3.
to furnish with, or to form into divisions by the use of, mullions.

Origin:
1560–70; metathetic variant of monial

un·mul·lioned, adjective
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World English Dictionary
mullion (ˈmʌlɪən) [Click for IPA pronunciation guide]
 
n
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
 
vb
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
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00:10
Mullion is one of our favorite verbs.
So is subtilize. Does it mean:
chat, to converse
to introduce subtleties into or argue subtly about.
Etymonline
Word Origin & History

mullion
"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
The fixed meeting rail is secured to integral mullion with screws.
Install new mullion cover and existing wood blocking.
Cut mullion full height of opening and anchor directly to window frame on each side.
The reinforcement extends the length of the mullion.
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