Definition of "biplane" [bi•plane]

• An airplane having two pairs of wings fixed at different levels, especially one above and one below the fuselage. (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.

• "The Gilmore house earned its “airplane” nickname immediately, both because of its shape, looking like a biplane from the east, and because of its location, which made it appear that the "plane" was about to take off over the city of Madison."
• "Lots of other small planes, some old, some new, also flew over but the only engine nearly as loud as the biplane was the tour boat out of Newburyport harbor."
• "Some of them can turn complete somersaults, though this is mostly done in monoplanes, and seldom in a biplane, which is much more stable in the air."