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Definition of Biplane
1. Noun. Old fashioned airplane; has two wings one above the other.
Definition of Biplane
1. n. An aëroplane with two main supporting surfaces one above the other.
2. a. Having, or consisting of, two superposed planes, aërocurves, or the like; of or pertaining to a biplane; as, a biplane rudder.
Definition of Biplane
1. a type of airplane [n -S] - See also: airplane