[hwahyt-n, wahyt-n]
verb (used with object), verb (used without object)
to make or become white.

1250–1300; Middle English whitenen; see white, -en1

unwhitened, adjective

Whiten, blanch, bleach mean to make or become white. To whiten implies giving a white color or appearance by putting a substance of some kind on the outside: to whiten shoes. To blanch implies taking away natural or original color throughout: to blanch celery by growing it in the dark. To bleach implies making white by placing in (sun) light or by using chemicals: to bleach linen, hair.

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
whiten (ˈwaɪtən)
to make or become white or whiter; bleach

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Some sugar refinement processes whiten the sugar with animal bones, so vegans
  often avoid white sugar.
Another would attempt to whiten clouds over the oceans by wafting tiny salt
  particles up into them.
The fibers are then buried in mud to whiten them, washed and combed.
Others may understand that it is often used to whiten teeth.
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