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

Warren Jeffs’ Flock in Denial Carol McKinley August 4, 2011

Historical Examples

The Aeroplane Claude Grahame-White and Harry Harper
High Adventure James Norman Hall
The Boy’s Book of New Inventions Harry E. Maule
The Trail of the Hawk Sinclair Lewis
An Aviator’s Field Book Oswald Blcke
The Rover Boys in the Air Edward Stratemeyer
The Mastery of the Air William J. Claxton
The Rover Boys in the Air Edward Stratemeyer
New York Times Current History: The European War, Vol. 8, Pt. 2, No. 1, July 1918 Various

a type of aeroplane having two sets of wings, one above the other Compare monoplane


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