whitenv. i.[OE. whitenen; cf. Icel. hvtna.] To grow white; to turn or become white or whiter; as, the hair whitens with age; the sea whitens with foam; the trees in spring whiten with blossoms.()v. t. To make white; to bleach; to blanch; to whitewash; as, to whiten a wall; to whiten cloth.()The broad stream of the Foyle then whitened by vast flocks of wild swans. (Macaulay.)()