Definition of whiten verb from the Oxford Advanced American Dictionary

 

whiten

 verb
verb
NAmE//ˈwaɪtn//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they whiten
 
he / she / it whitens
 
past simple whitened
 
-ing form whitening
 
 
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to become white or whiter; to make something white or whiter He gripped the wheel until his knuckles whitened. Her face whitened when she heard the news. whiten something Snow had whitened the tops of the trees.
See the Oxford Advanced Learner's Dictionary entry: whiten