Usually means: Line passing through lens center.
Definitions Related words Mentions
We found 10 dictionaries that define the word optical axis:

General (5 matching dictionaries)
  1. optical axis: Oxford Learner's Dictionaries
  2. optical axis: Wiktionary
  3. optical axis: Dictionary.com
  4. Optical axis: Wikipedia, the Free Encyclopedia
  5. optical axis: TheFreeDictionary.com

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

Medicine (3 matching dictionaries)
  1. optical axis: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. Optical axis: Medical dictionary

Tech (1 matching dictionary)
  1. PhotoNotes Dictionary of Film and Digital Photography (No longer online)

Definitions from Wiktionary (optical axis)

noun:  (optics) An imaginary line within an optical system around which there is rotational symmetry.

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