From Middle English glas, from Old English glæs, from Proto-Germanic *glasą, possibly related to Proto-Germanic *glōaną ("to shine") (compare glow), and ultimately from the Proto-Indo-European root *ǵʰel-. Cognate with West Frisian glês, Dutch glas, Low German Glas, German Glas, Swedish glas, Icelandic gler.
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