Usually means: Angle where total internal reflection ceases.
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We found 8 dictionaries that define the word extinction angle:

General (7 matching dictionaries)
  1. extinction angle: Merriam-Webster
  2. extinction angle: Vocabulary.com
  3. extinction angle: Dictionary.com
  4. extinction angle: Rhymezone
  5. extinction angle: FreeDictionary.org
  6. extinction angle: Mnemonic Dictionary
  7. extinction angle: TheFreeDictionary.com

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

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Definitions from WordNet (extinction angle)

▸ noun:  the angle from its axis that a crystal must be rotated before appearing maximally dark when viewed in polarized light


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