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Related to toadstone: Bufonite
A stone once worn as a charm and believed to have been formed in the body of a toad.
(Geological Science) rare an amygdaloidal basalt occurring in the limestone regions of Derbyshire
[C18: perhaps from a supposed resemblance to a toad's spotted skin]
any of various stonelike objects, usu. fossilized animal parts, formerly supposed to have been formed in the body of a toad, worn esp. as amulets to protect against poison.