The Proto-Indo-European word *h₂erĝ-
Word *h₂erĝ-
Meaning white
See also Proto-Indo-European: *h₂r̥ĝ(u)- ‘white’
Proto-Indo-European: *h₂erĝn̥tom ‘silver, white (metal)’
Synonyms *ar(e)-ĝ-, *h₄elbʰós, *k̂weitos, *bʰelh₁-

Comments
Mallory J.P. and Adams D. (2006)