Noun
convertiplane (plural convertiplanes)
Any of several forms of aircraft capable of both vertical takeoff and landing, and of normal forward flight; usually has variable geometry wings that can rotate
The XV-1 Convertiplane compound helicopter made the first successful conversion from vertical rotor lift. Source: Internet
Powered lift main Convertiplane main A convertiplane takes off under rotor lift like a helicopter, then transitions to fixed-wing lift in forward flight. Source: Internet