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retrodirective

[re-troh-di-rek-tiv, -dahy-] /ˌrɛ troʊ dɪˈrɛk tɪv, -daɪ-/
adjective, Optics.
1.
(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.
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Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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