reflector
/rɪˈflektə(r)/noun
1- a piece of glass or metal for reflecting light in a required direction, e.g. a red one on the back of a motor vehicle or bicycle反光镜; （汽车或自行车尾部红色的）反光罩。
1.1
- an object or device which reflects radio waves, seismic vibrations, sound, or other waves（无线电波、地震振荡、声音或其他波的）反射体, 反射器。
1.2
- a reflecting telescope反射式望远镜。