Whiten \Whit"en\, v. i. [imp. & p. p. Whitened; p. pr. & vb. n. Whitening.]

[OE. whitenen; cf. Icel. hv[=i]tna.]

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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Whitening \Whit"en*ing\, n.

1. The act or process of making or becoming white.

2. That which is used to render white; whiting. [R.]

Whitening stone, a sharpening and polishing stone used by cutlers; also, a finishing grindstone of fine texture.

Source: Webster's Revised Unabridged Dictionary (1913)