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"glow" is also used as a crossword clue. If that's what you saw, the answer is often radiance (8 letters).
Definitions
experience a feeling of well-being or happiness, as from good health or an intense emotion
Word origin
both from Proto-Germanic *glōaną (“to glow”), ultimately from Proto-Indo-European *ǵʰleh₁- (“to shine, glow; to be shining, glowing”). Possibly a doublet of glass.
Used in a sentence
“Iron glows red hot when heated to near its melting point.”
“The fire was still glowing after ten hours.”
“The mettled Steeds, vvhen from their Noſtrils flovvs / The ſcorching Fire, that in their Entrails glovvs.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer7 curated clues
01“Dim steady shine”4 letters
02“Light from embers”4 letters
03“Soft light from coals”4 letters
04“Soft shine”4 letters
05“Soft steady light”4 letters
06“Steady gentle light”4 letters
07“Soft light”4 letters
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