Aviation Dictionary
هواپیمایی که هم قادر به پرواز عمودی مثل هلیکوپتر وهم پرواز افقی میباشد
A convertiplane in popular usage is an aircraft that converts in flight to change its method of obtaining lift. The FAI define it more narrowly as an aircraft which uses rotor power for vertical takeoff and landing (VTOL) and converts to fixed-wing lift in normal flight.