English

alumstone

From alum + stone.

A compound of alum + stone

Proto-Indo-European *h₂elut- ‘beer’

Latin alūmen

Anglo-Norman alum

Middle English alym ‘any alum, especially potash alum’

English alum

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 alunite

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

Etymograph / alumstone