mid-15c., "glowing heat," from glow (v.). Meaning "a flush of radiant feeling" is from 1793.
Old English glowan "to glow, shine as if red-hot," from Proto-Germanic *glo- (source also of Old Saxon gloian, Old Frisian gled "glow, blaze," Old Norse gloa, Old High German gluoen, German glühen "to glow, glitter, shine"), from PIE root *ghel- (2) "to shine," with derivatives referring to bright materials and gold. Figuratively from late 14c. Related: Glowed; glowing. Swedish dialectal and Danish glo also have the extended sense "stare, gaze upon," which is found in Middle English.
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