The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
kweit-
DEFINITION:
Also kweid-. White; to shine. Oldest form *weit-, becoming *kweit- in centum languages. 1. Suffixed variant form *kweid-o-.a.white; Whitsunday, from Old English hwt, white; b.witloof, from Middle Dutch wit, white; c.whiting2, from Middle Dutch wijting, whiting; d.(i)edelweiss, from Old High German hwz,wz, white; (ii)bismuth, from obsolete German Bismut,Wismut, perhaps obscurely related to Old High German wz, white. a–d all from Germanic *hwtaz.2. Suffixed o-grade variant form *kwoid-yo-.wheat, from Old English hwte, wheat (from the fine white flour it yields), from Germanic *hwaitjaz. (Pokorny 3. ei- 628.)
weit-, becoming *kweit- in centum languages. 1. Suffixed variant form *kweid-o-. a. white; Whitsunday, from Old English hw
t, white; b. witloof, from Middle Dutch wit, white; c. whiting2, from Middle Dutch wijting, whiting; d. (i) edelweiss, from Old High German hw
te, wheat (from the fine white flour it yields), from Germanic *hwaitjaz. (Pokorny 3. 
ei- 628.) 
