from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A strip of wood or metal separating and holding panes of glass in a window.
  • n. A vertical framing member set between two rails in a door or in paneling.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One of the separators between panes of glass in a composite window.

from the GNU version of the Collaborative International Dictionary of English

  • n. Same as mullion; -- especially used in joiner's work.

from The Century Dictionary and Cyclopedia

  • n. The central vertical piece that divides the panels of a door.


Middle English mountaunt, upright post or stud, from Old French montant, from present participle of monter, to mount; see mount1.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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