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ret•ro•di•rec•tive



Pronunciation: (re"trō-di-rek'tiv, -dī-), [key]
adj. 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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

retrocognateretrofire

 

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