Reflector/rɪˈflektər/ Definition 1 of 3Pro Tip 1/3Visibility Aid Reflectors on vehicles or clothing ensure the wearer or object is seen. The runner wore a jacket with reflectors for the night jog. Pro Tip 2/3Not a Source Reflectors do not create light; they send back existing light. The roadside was lined with reflectors that shone in the car's headlights. Pro Tip 3/3Safety Feature Reflectors are crucial for safety in low-light environments. Her bicycle's reflector alerted drivers to her presence.