Also called dormer window. a vertical window in a projection built out from a sloping roof.
the entire projecting structure.

1585–95; < Middle French dormoir dormitory

dormered, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dormer (ˈdɔːmə)
Also called: dormer window a construction with a gable roof and a window at its outer end that projects from a sloping roof
[C16: from Old French dormoir, from Latin dormītōriumdormitory]

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

1592, originally "window of a sleeping room," from M.Fr. dormeor "sleeping room," from dormir "to sleep," from L. dormire (see dormant).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Porches wrap about the first two floors, and dormer windows punctuate the
  mansard roof.
But from its three dormer windows, the views are among the best in the inn.
Application is to construct an addition and dormer and modify masonry openings.
Examples can include a large section of roofing, or a dormer or chimney.
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