whit ‧ en ‧ er /ˈwaɪtnə $ -ər/ BrE AmE ( also whit‧en‧ing /ˈwaɪtnɪŋ/) noun [uncountable and countable]
[ Word Family: noun : ↑ white , ↑ whiteness , ↑ whitener ; verb : ↑ whiten ; adjective : ↑ white ]
a substance used to make something more white
whit ‧ en ‧ er /ˈwaɪtnə $ -ər/ BrE AmE ( also whit‧en‧ing /ˈwaɪtnɪŋ/) noun [uncountable and countable]
[ Word Family: noun : ↑ white , ↑ whiteness , ↑ whitener ; verb : ↑ whiten ; adjective : ↑ white ]
a substance used to make something more white
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012