quadruplane
/ˈkwɒdrʊpleɪn/(also quadriplane)
noun
1 Mathematics. A structure consisting of four rigid plane pieces, each in the form of a right-angled V, hinged end to end to form a closed chain.
2 Aeronautics. An aeroplane with four sets of wings, one above another. Now historical.
Origin
Late 19th century; earliest use found in James Joseph Sylvester (1814–1897), mathematician. From quadru- + plane.