- old fashioned airplane; has two wings one above the other
- A biplane is a fixed-wing aircraft with two main wings. The Wright brothers' Wright Flyer used a biplane design, as did most aircraft in the early years of aviation. While a biplane wing structure has a structural advantage, it produces more drag than a similar monoplane wing. ...
- An aircraft or glider with two main supporting surfaces (two wings on each side) above one another.
- What you'll say to your bird if flying costs keep going up
- arrangement of the filament of a lamp in two rows, one behind he other to give a smoother light better suited for use in profiles projecting gobos. See also < A HREF="gloss-m.html#MPLNE">mono-plane
- Two primary wings, usually located one above the other.
- An aircraft with two pairs of wings, one pair above the other. Biplanes were popular until the 1930s.
- Aircraft with a pair of wings on each side of the fuselage.