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biplane

[bahy-pleyn]
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noun
  1. an airplane with two sets of wings, one above and usually slightly forward of the other.
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Origin of biplane

First recorded in 1870–75; bi-1 + (air)plane
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for biplane

biplane

noun
  1. a type of aeroplane having two sets of wings, one above the otherCompare monoplane
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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

Word Origin and History for 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.

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Online Etymology Dictionary, © 2010 Douglas Harper