blinker
noun
1. a light that flashes on and off; used as a signal or to send messages
Similar word(s): flasher
Definition categories: man–made, light
2. a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn
Similar word(s): trafficator
Definition categories: communication
3. blind consisting of a leather eyepatch sewn to the side of the halter that prevents a horse from seeing something on either side