toad·stone (t d stn )n. A stone once worn as a charm and believed to have been formed in the body of a toad. |
toadstone [ˈtəʊdˌstəʊn]
n
(Earth Sciences / Geological Science) Rare an amygdaloidal basalt occurring in the limestone regions of Derbyshire
[perhaps from a supposed resemblance to a toad's spotted skin]
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