whiten

From Middle English whitenen, whitnen, from Old Norse hvítna (“to whiten”), from Proto-Germanic hwītnōną (“to whiten, become white”), from Proto-Indo-European kwind-, *kwint- (“bright”), equivalent to white + -en. Cognate with Icelandic hvítna (“to whiten”), Swedish vitna, hvitna (“to whiten”), Danish hvidne (“to whiten”). Compare Old English hwītian (“to whiten, become white, be white, make white”).