The Proto-Indo-European word *h₂eug-
Word *h₂eug-
Meaning to shine, to become bright
Synonyms *ĝhel-1, ĝhelǝ-, ĝhlē-, *k̂euk-, *bʰeh₂-, *bʰlēiĝ, *ghel-, *dei-

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