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1. A strip of wood or metal separating and holding panes of glass in a window.
2. A vertical framing member set between two rails in a door or in paneling.
[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, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Building) another name (esp US) for glazing-bar
[C17: variant of C15 mountant, from Old French montant, present participle of monter to mount1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a bar for holding the edges of window panes within a sash.
[1300–50; earlier mountan, montan, Middle English mountaun, mountain < Middle French montant, n. use of present participle of monter to mount1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.