'Whitener' definitions:

Definition of 'whitener'

From: WordNet
noun
An agent that makes things white or colorless [syn: bleaching agent, bleach, blanching agent, whitener]

Definition of 'Whitener'

From: GCIDE
  • Whitener \Whit"en*er\, n.
  • 1. One who, or that which, whitens; a bleaching agent; a bleach; a bleacher; a blancher; a whitewasher. [1913 Webster]
  • 2. A chemical used as an adjunct to laundering white cloth, which makes white cloth appear whiter. A bluing agent. [PJC]