quadcopter
noun [ C ] uk/ˈkwɒd.kɒp.tər/ us/ˈkwɑːd.kɑːp.tɚ/
四轴飞行器
a small remote-controlled aircraft like a helicopter, with four blades that go around on top, used especially to film or photograph things from the air. A quadcopter is a type of drone.
Compare: hexacopteroctocopter