retrodirective

[ 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.

QUIZZES

THIS WEEK’S WORD OF THE DAY QUIZ IS POSITIVELY FELICIFIC

Do you study our Words of the Day with great assiduity? See how many you remember from March 3 to April 5!

Question 1 of 7

transliterate

to remove or destroy all traces of.

to change (letters, words, etc.), into corresponding characters of another alphabet or language.

to explain in terms that can be more easily understood.

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Origin of retrodirective

retro- + directive

Words nearby retrodirective

retrocollic spasm, retroconduction, retrocursive, retrocuspid papilla, retrodeviation, retrodirective, retrodisplacement, retrofire, retrofit, retroflex, retroflexion