Definition of whiten verb from the Oxford Advanced Learner's Dictionary

 

whiten

 verb
verb
BrE BrE//ˈwaɪtn//
 
; NAmE NAmE//ˈwaɪtn//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they whiten
BrE BrE//ˈwaɪtn//
 
; NAmE NAmE//ˈwaɪtn//
 
he / she / it whitens
BrE BrE//ˈwaɪtnz//
 
; NAmE NAmE//ˈwaɪtnz//
 
past simple whitened
BrE BrE//ˈwaɪtnd//
 
; NAmE NAmE//ˈwaɪtnd//
 
past participle whitened
BrE BrE//ˈwaɪtnd//
 
; NAmE NAmE//ˈwaɪtnd//
 
-ing form whitening
BrE BrE//ˈwaɪtnɪŋ//
 
; NAmE NAmE//ˈwaɪtnɪŋ//
 
 
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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 American Dictionary entry: whiten