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Entry 2 senses · 2 variants Webster, 1913

Biplane

/bīp'-lānˌ/ · Bi·plane · IPA /ˈbaɪpleɪn/
01 n. An aëroplane with two main supporting surfaces one above the other.
  1. 1.
    An aëroplane with two main supporting surfaces one above the other.(Aëronautics)
02 a. Having, or consisting of, two superposed planes, aërocurves, or the like; of or pertaining to a biplane; as, a biplane rudder.
  1. 1.
    Having, or consisting of, two superposed planes, aërocurves, or the like; of or pertaining to a biplane; as, a biplane rudder.(Aëronautics)