Usually means: Substance that increases light reflection.
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We found 10 dictionaries that define the word brightener:

General (7 matching dictionaries)
  1. brightener: Merriam-Webster
  2. brightener: Collins English Dictionary
  3. Brightener, brightener: Wordnik
  4. brightener: Wiktionary
  5. brightener: Infoplease Dictionary
  6. brightener: Dictionary.com
  7. brightener: TheFreeDictionary.com

Business (1 matching dictionary)
  1. brightener: Legal dictionary

Computing (1 matching dictionary)
  1. brightener: Encyclopedia

Tech (1 matching dictionary)
  1. AUTOMOTIVE TERMS (No longer online)

(Note: See brighten as well.)

Definitions from Wiktionary (brightener)

noun:  One who or that which brightens.
noun:  A chemical agent that absorbs ultraviolet and violet light and re-emits blue light by fluorescence, used to make fabric or paper look whiter.
noun:  (metallurgy) Any substance added to an electrolytic bath to yield a brighter electroplated surface.

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