Old English glæm "a brilliant light; brightness; splendor, radiance, beauty," from Proto-Germanic *glaimiz (source also of Old Saxon glimo "brightness;" Middle High German glim "spark," gleime "glow-worm;" German glimmen "to glimmer, glow;" Old Norse glja "to shine, glitter, glisten"), from PIE root *ghel- (2) "to shine."
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