brightener

[brahyt-n-er]
noun
1.
a person or thing that brightens.
2.
a chemical or other agent used to increase brightness, as one added to toothpaste or detergent to intensify the cleansing or bleaching process.

Origin:
1790–1800; brighten + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
brighten (ˈbraɪtən)
 
vb
1.  to make or become bright or brighter
2.  to make or become cheerful
 
'brightener
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Optical-brightener samplers were installed along with each sandbag sampler.
Cost savings will result from the avoided purchase of brightener and reduced disposal costs.
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