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brighten +‎ -er


brightener (plural brighteners)

  1. One who or that which brightens.
    • 2006, Linda Fritzinger, Diplomat Without Portfolio: Valentine Chirol, His Life and "The Times"
      Chirol's own advice was simple: get the Russian agreement signed. March, month of change, brightener of days and moods, brought that action notably closer.
  2. A chemical agent that absorbs ultraviolet and violet light and re-emits blue light by fluorescence, used to make fabric or paper look whiter.
  3. (metallurgy) Any substance added to an electrolytic bath to yield a brighter electroplated surface.