Definition of "dormer" [dor•mer]

• A window set vertically into a small gable projecting from a sloping roof. (noun)
• The gable holding such a window. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I used to pretend I was a lighthouse keeper and the dormer was my lighthouse, and I’d look out for boats about to crash on our ront lawn, which I pretended was a treacherous beach."
• "The house rose three stories, the third being a steep roof with five dormer windows across."
• "The left portion sat low, with a simple sloping roof and dormer windows for its second floor."