mansard roof

from The American Heritage® Dictionary of the English Language, 4th Edition

• n. A four-sided roof having a double slope on all sides, with the lower slope much steeper than the upper.

from Wiktionary, Creative Commons Attribution/Share-Alike License

• n. A roof having two slopes on each side, the lower one having a steeper pitch than the upper; this increases the volume of the enclosed space.
• n. A steeper roof that terminates into a flat roof at its high point.

from the GNU version of the Collaborative International Dictionary of English

• A hipped curb roof; that is, a roof having on all sides two slopes, the lower one being steeper than the upper one.

from The Century Dictionary and Cyclopedia

• n. See roof.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• n. a hip roof having two slopes on each side