[ re-troh-di-rek-tiv, -dahy- ]
/ ˌrɛ troʊ dɪˈrɛk tɪv, -daɪ- /
(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.
- retrocuspid papilla,
Origin of retrodirective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019