Etymology

madstone

M3A1D2S1T1O1N1E1

Today it means: A stone believed to have the power to heal the bite of a rabid or venomous animal. Full definition →

First used 19th c.
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The story

From mad + stone.

First known use, by meaning

  • from 19th c. A stone believed to have the power to heal the bite of a rabid or venomous animal.

Etymology from Wiktionary, CC BY-SA 4.0.