Bi"plane (?), n. [Pref. bi- +
plane.] (Aeronautics)
An aeroplane with
two main supporting surfaces one above the other.
© Webster 1913.
Bi"plane, a. (Aeronautics)
Having, or consisting of, two superposed planes, aerocurves,
or the like; of or pertaining to a biplane; as, a biplane
rudder.
© Webster 1913.