Usually means: Measure of light absorption thickness.
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We found 7 dictionaries that define the word optical depth:

General (2 matching dictionaries)
  1. Optical depth (astrophysics), Optical depth: Wikipedia, the Free Encyclopedia
  2. optical depth: Wiktionary

Computing (1 matching dictionary)
  1. optical depth: Encyclopedia

Science (3 matching dictionaries)
  1. Optical Depth: Solar Radiation Resource Terms
  2. Optical Depth: Eric Weisstein's World of Physics
  3. Optical Depth: Extragalactic Astronomy

Tech (1 matching dictionary)
  1. Glossary of Meteorology (No longer online)

Definitions from Wiktionary (optical depth)

noun:  (physics) The natural logarithm of the ratio of amount of radiation that hits an object to the amount of radiation that emerges from that object on the other side.

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