Meaning

noun an alert and refreshed state

noun light from nonthermal sources

noun the phenomenon of light emission by a body as its temperature is raised

originThe verb is derived from Middle English glouen, glowen (“to give off heat and light without flame; of a thing: to be heated until red hot; to be brightly coloured; to shine brightly; (figurative) to be filled with emotion; of the face, etc.: to turn red, flush; etc.”), and then either: * from Old English glōwan (“to glow”) (a strong verb), from Proto-West Germanic *glōan (“to glow”); or * because…

Etymology from Wiktionary, CC BY-SA 3.0