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retro directive

 - 1 dictionary result

ret⋅ro⋅di⋅rec⋅tive

[re-troh-di-rek-tiv, -dahy-]
–adjective Optics.
(of a mirror, reflector, etc.) having three reflecting surfaces so oriented that a ray of light is reflected in a direction parallel but opposite to its original direction.

Origin:
retro- + directive
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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