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[re-troh-di-rek-tiv, -dahy-] /ˌrɛ troʊ dɪˈrɛk tɪv, -daɪ-/
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.


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  • Retrodisplacement

    retrodisplacement ret·ro·dis·place·ment (rět’rō-dĭs-plās’mənt) n. A backward displacement, such as retroflexion.

  • Retract

    verb (used with object) 1. to draw back or in: to retract fangs. verb (used without object) 2. to draw back within itself or oneself, fold up, or the like, or to be capable of doing this: The blade retracts. verb (used with object) 1. to withdraw (a statement, opinion, etc.) as inaccurate or unjustified, […]

  • Retracking

    noun 1. a structure consisting of a pair of parallel lines of rails with their crossties, on which a railroad train, trolley, or the like runs. 2. a wheel rut. 3. evidence, as a mark or a series of marks, that something has passed. 4. Usually, tracks. footprints or other marks left by an animal, […]

  • Retrofit

    verb (used with object), retrofitted or retrofit, retrofitting. 1. to modify equipment (in airplanes, automobiles, a factory, etc.) that is already in service using parts developed or made available after the time of original manufacture. 2. to install, fit, or adapt (a device or system) for use with something older: to retrofit solar heating to […]

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