device that reflects radiation
"The satellite's large reflector bounces radio waves back to Earth for data transmission."
optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece
"Isaac Newton invented the reflecting telescope in 1668"
Something which reflects heat, light or sound, especially something having a reflecting surface.
"The car's rearview mirror acts as a reflector to bounce sunlight away from her eyes while driving in bright conditions."