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Origin of dormer

1585–95; < Middle French dormoir dormitory
Related formsdor·mered, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for dormer


  1. a construction with a gable roof and a window at its outer end that projects from a sloping roofAlso called: dormer window

Word Origin for dormer

C16: from Old French dormoir, from Latin dormītōrium dormitory
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for dormer

1590s, originally "window of a sleeping room," from Middle French dormeor "sleeping room," from dormir "to sleep" (see dormant).

Online Etymology Dictionary, © 2010 Douglas Harper