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gleam

/ɡliːm/

small, brief, or faint light

From Proto-Indo-European ghel (to shine).

noun
noun
verb
ghel
Proto-Indo-European
Verified
*ghel- (2)
reconstructed
to shine

from PIE root *ghel- (2) "to shine." Figurative or transferred gleam in (someone's) eye (n.) "barely formed idea"...

Proto-Germanic
Verified
*glaimiz
reconstructed
brightness; splendour

from Proto-Germanic *glaimiz (source also of Old Saxon glimo "brightness;" Middle High German glim "spark," gleime...

+1 more source
Old English
Verified
glǣm
gleam; brilliance

from Old English glǣm (“gleam”)

Middle English
Verified
glem / gleam
shaft of light, radiance, a fleeting sparkle

from Middle English glem, gleam, gleme (“shaft of light; part of a comet’s tail; reflected sparkle; dawn; daylight;...

Modern English
gleam

A tiny flash of light can carry a whole family tree. Long before English speakers were using gleam for a shard of brightness—or for that lovely phrase “a gleam in someone’s eye”—Germanic speakers had a word built on brightness itself, and it traces back to a Proto-Indo-European root meaning “to shine.” That same shining old root turns up in cousins like glitter, glisten, and glint, each one a different way light behaves when it hits a surface and refuses to sit still. The word’s medieval life was wonderfully practical: a gleam could be dawn, a comet’s tail, or just the quick flash that makes a thing look alive for an instant. Wiktionary gives a slightly different deep ancestor, *ǵʰley- rather than *ghel-, which is the sort of scholarly fork-in-the-road etymology lovers enjoy arguing over, but either way the family business is unmistakable: catching light before it gets away.

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