Usually means: Loss of sharpness in image.
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We found 13 dictionaries that define the word defocus:

General (9 matching dictionaries)
  1. defocus: Oxford Learner's Dictionaries
  2. defocus: American Heritage Dictionary of the English Language
  3. defocus: Collins English Dictionary
  4. defocus: Wordnik
  5. defocus: Wiktionary
  6. defocus: Infoplease Dictionary
  7. defocus: Dictionary.com
  8. Defocus: Wikipedia, the Free Encyclopedia
  9. defocus: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. defocus: Encyclopedia

Medicine (2 matching dictionaries)
  1. defocus: Merriam-Webster Medical Dictionary
  2. defocus: Medical dictionary

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

Definitions from Wiktionary (defocus)

verb:  (transitive) To cause (a lens, or a beam of light or particles, etc.) to be out of focus.
noun:  The process of going out of focus.
noun:  (optics) The distance by which the focal point is in front of (positive defocus) or beyond (negative defocus) the image or target surface.

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