The upper story formed by the lower slope of a mansard roof.(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.
Use "mansard" in a sentence
"A man of average height must stoop under the beams of the little mansard chamber in No. 20 Bonngasse."
"His mansard-roofed summer mansion- called Bleak House - stood at what is now 13th and Geranium until it was torn down in 1916."
"It has a mansard roof, and is in northern California."