Having or composed of two superposed planes aeumlrocurves or perhaps the want of or with respect to a biplane as a biplane rudder
- An aeumlroplane with two main supporting surfaces one over the other
- traditional plane; features two wings one above the other
aircraft with two complete wings, one over the other, 1874, as a theoretical thought; very first attested 1908 in reference to the genuine article; from bi- + jet (n.1). So-called from two "planes" for the double wings.
About a year later Henry Farman made several short flights on a machine of the biplane type, consisting of two main supporting surfaces one above the other, with a box-shaped vertical rudder behind and two small balancing aeroplanes in front.