Bi plane


an airplane with two sets of wings, one above and usually slightly forward of the other.

1870–75; bi-1 + (air)plane Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
biplane (ˈbaɪˌpleɪn)
Compare monoplane a type of aeroplane having two sets of wings, one above the other

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1874, as a theoretical notion; first attested 1908 in reference to the real thing; from bi- + plane. So called from the two "planes" of the double wings.
Online Etymology Dictionary, © 2010 Douglas Harper
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