Definition of biplane noun from the Oxford Advanced Learner's Dictionary

 

biplane

 noun
noun
BrE BrE//ˈbaɪpleɪn//
 
; NAmE NAmE//ˈbaɪpleɪn//
 
Aircraft
 
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an early type of plane with two sets of wings, one above the other compare monoplane See related entries: Aircraft
See the Oxford Advanced American Dictionary entry: biplane