English

madstone

From mad + stone.

A compound of mad + stone

Proto-Indo-European *meyth₂- ‘to change’

…

Proto-Germanic *maidijaną ‘to change’

Old English *mǣdan

Old English ġemǣdan

Middle English mad

English mad

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 stone believed to have the power to heal the bite of a rabid or venomous animal.

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

Etymograph / madstone