Usually means: Rotation of plane-polarized light.
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We found 21 dictionaries that define the word optical activity:

General (11 matching dictionaries)
  1. optical activity: Merriam-Webster
  2. optical activity: Oxford Learner's Dictionaries
  3. optical activity: American Heritage Dictionary of the English Language
  4. optical activity: Collins English Dictionary
  5. optical activity: Wordnik
  6. optical activity: Wiktionary
  7. optical activity: Infoplease Dictionary
  8. optical activity: Dictionary.com
  9. Optical activity: Wikipedia, the Free Encyclopedia
  10. optical activity: FreeDictionary.org
  11. optical activity: TheFreeDictionary.com

Business (2 matching dictionaries)
  1. optical activity: Legal dictionary
  2. optical activity: Financial dictionary

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

Medicine (4 matching dictionaries)
  1. optical activity: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. optical activity: Medical dictionary

Science (3 matching dictionaries)
  1. Chemistry Dictionary (No longer online)
  2. Optical Activity: Eric Weisstein's World of Physics
  3. General Chemistry Online (No longer online)

Definitions from Wiktionary (optical activity)

noun:  (physics) a property caused by asymmetrical molecular or crystal structure that enables a compound or crystal to rotate the plane of incident polarized light
noun:  (chemistry) A measure of the amount of optical rotation produced by a standard amount of a substance

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