glow (v.) Look up glow at Dictionary.com
Old English glowan "to glow, shine as if red-hot," from Proto-Germanic base *glo- (cognates: Old Saxon gloian, Old Frisian gled "glow, blaze," Old Norse gloa, Old High German gluoen, German glühen "to glow"), from PIE *ghel- (2) "to shine," with derivatives referring to bright materials and gold (see glass). Figuratively from late 14c. Related: Glowed; glowing.
glow (n.) Look up glow at Dictionary.com
mid-15c., from glow (v).