Usually means: Range of light wavelengths visible.
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We found 4 dictionaries that define the word optical spectrum:

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

Computing (1 matching dictionary)
  1. Optical spectrum: Encyclopedia

Medicine (1 matching dictionary)
  1. Optical spectrum: Medical dictionary

Definitions from Wiktionary (optical spectrum)

noun:  The colours of the rainbow.
noun:  (physics) The distribution of colours produced when white light passes through a prism.
noun:  (astronomy, physics) The range of frequencies of visible light.

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