Definition of optical brightener in English:

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optical brightener

Pronunciation: /ˈäptəkəl ˈbrītnər/

noun

A fluorescent substance added to detergents in order to produce a whitening effect on laundry.
Example sentences
  • Softeners, optical brighteners, and antistatic agents also may be used on some fabrics.
  • As a result, the materials that contain optical brighteners appear to reflect more light than is incident upon them and the blue-violet emission tends to offset yellowish reflected light making the material appear whiter.
  • Arches Bright White is created without optical brighteners or bleaches with only the purest well water and cotton fibers, company officials said.

For editors and proofreaders

Syllabification: op·ti·cal bright·en·er

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