From Middle English glad, gled, from Old English glæd ("shining; bright; cheerful; glad"), from Proto-Germanic *gladaz ("shiny; gleaming; radiant; happy; glossy; smooth; flat"), from Proto-Indo-European *gʰladʰ-, from *ǵʰelh₂-.
Cognate with Scots gled, glaid, Saterland Frisian glääd ("smooth; sleek"), West Frisian glêd ("smooth"), Dutch glad ("smooth; sleek; slippery"), German glatt ("smooth; sleek; slippery"), Danish, Norwegian and Swedish glad ("glad; happy; cheerful"), Icelandic glaður ("glad; joyful; cheery"), Latin glaber ("smooth; hairless; bald"). glatt.
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