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reflector (n.)

also, less correctly, reflecter, 1660s, "one who reflects or considers;" by 1797 as "that which reflects, a surface or apparatus to reflect light or heat in a desired direction;" agent noun in Latin form from reflect. As an attachment to a vehicle, etc., from 1909. As a type of telescope, 1767.

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Definitions of reflector from WordNet

reflector (n.)
device that reflects radiation;
reflector (n.)
optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece;
Synonyms: reflecting telescope
From wordnet.princeton.edu