English

glowstone

From glow + stone.

A compound of glow + stone

Proto-Indo-European *ǵʰleh₁- ‘to shine, glow’

Middle English glouen

English glow

Proto-Indo-European *steyh₂- ‘to stiffen’

…

Proto-Germanic *stainaz

Proto-West Germanic *stain

Old English stān

Middle English ston ‘a stone’

English stone

Today it means

noun A luminescent stone.

Language periods are conventional ranges, not dates for this word.

Etymograph / glowstone