retroreflector

noun
ret·ro·re·flec·tor | \ˌre-trō-ri-ˈflek-tər \

Definition of retroreflector 

: a device that reflects radiation (such as light) so that the paths of the reflected rays are parallel to those of the incident rays

First Known Use of retroreflector

1946, in the meaning defined above

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The first known use of retroreflector was in 1946

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