[ 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.

Nearby words

  1. retroconduction,
  2. retrocopulation,
  3. retrocursive,
  4. retrocuspid papilla,
  5. retrodeviation,
  6. retrodisplacement,
  7. retrofire,
  8. retrofit,
  9. retroflex,
  10. retroflexion

Origin of retrodirective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019