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retrodirective

[re-troh-di-rek-tiv, -dahy-]
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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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Origin of retrodirective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018