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biplane

[bahy-pleyn] /ˈbaɪˌpleɪn/
noun
1.
an airplane with two sets of wings, one above and usually slightly forward of the other.
Origin
1870-1875
1870-75; bi-1 + (air)plane
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for bi plane

biplane

/ˈbaɪˌpleɪn/
noun
1.
a type of aeroplane having two sets of wings, one above the other Compare monoplane
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
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Word Origin and History for bi plane

biplane

n.

airplane with two full wings, one above the other, 1874, as a theoretical notion; first attested 1908 in reference to the real thing; from bi- + plane (n.1). So called from the two "planes" of the double wings.

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for bi plane

biplane

airplane with two wings, one above the other. In the 1890s this configuration was adopted for some successful piloted gliders. The Wright brothers' biplanes (1903-09) opened the era of powered flight. Biplanes predominated in military and commercial aviation from World War I through the early 1930s, but the biplane's greater maneuverability could not offset the speed advantage of the lighter monoplane. After World War II, biplanes were used only for special purposes: crop dusting and sport (aerobatic) flying.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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