reflector

[ri-flek-ter]
noun
1.
a person or thing that reflects.
2.
a body, surface, or device that reflects light, heat, sound, or the like.
4.
a substance, as graphite or heavy water, used to prevent the escape of neutrons from the core of a nuclear reactor.

Origin:
1655–65; reflect + -or2

nonreflector, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reflector (rɪˈflɛktə)
 
n
1.  a person or thing that reflects
2.  a surface or object that reflects light, sound, heat, etc
3.  a small translucent red disc, strip, etc, with a reflecting backing on the rear of a road vehicle, which reflects the light of the headlights of a following vehicle
4.  another name for reflecting telescope
5.  part of an aerial placed so as to increase the forward radiation of the radiator and decrease the backward radiation

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

reflector re·flec·tor (rĭ-flěk'tər)
n.
A surface that reflects light, heat, or sound.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Roasting is cooking before a clear fire, with a reflector to concentrate the
  heat.
The logo on the heel doubles as a reflector when light hits it, which is great
  for night riding.
They pop in headlights as well as any standard reflector but disappear in the
  daylight.
Create a solar reflector flap by centering an outline on the lid the same size
  as the smaller oven opening.
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