'Quadruplane' definitions:
Definition of 'Quadruplane'
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Quadruplane \Quad"ru*plane\, n. [L. quadru- in comp. + E.
plane.]
An airplane with four superposed main supporting surfaces.
Contrasted with triplane biplane and monoplane. They
are now used only for hobbyist or historical activities.
[Webster 1913 Suppl. +PJC]
