From Longman Dictionary of Contemporary Englishreflectorre‧flec‧tor /rɪˈflektə $ -ər/ noun [countable] 1 
TTBDa small piece of plastic that is fastened to a bicycle or to a piece of clothing, so that it can be seen more easily at night. All bicycles sold in the UK must be fitted with reflectors.2 REFLECTa surface that reflects light
TTBDa small piece of plastic that is fastened to a bicycle or to a piece of clothing, so that it can be seen more easily at night. All bicycles sold in the UK must be fitted with reflectors.2 REFLECTa surface that reflects lightExamples from the Corpus
reflector• Sulphur dioxide particles in the atmosphere act as reflectors and bounce some of the sun's rays back into space.• It was theorized that the Midas belt would serve as a passive reflector for the relay of defense communications.• Alternatively, the light can be bounced off special reflectors, and sheets of white expanded polystyrene are ideal for this purpose.• The second type of telescope is the reflector.• This reflector shows each car, which other cars are approaching, from any one of a half-dozen directions.• Each wears reflector sunglasses, and the gleam off the frames matches the gleam off the buckles on their holsters. 