What is a convertiplane? Here are some definitions.
Noun
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
Examples
Nineteen US Marines died when a high-tech Osprey convertiplane crashed and burned as it landed at an airport near Tucson, Arizona.
The vertical-lift aircraft, also known as a convertiplane, was introduced to the US military last September.