TOADSTONE

toadstone. Toadstone, n. a genus of earth of a brownish gray color

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Toad″stone′ (?), n. 1. 1. (Min.) A local name for the igneous rocks of Derbyshire, England; — said by some to be derived from the German todter stein, meaning dead stone, that is, stone which contains no ores.
2. 2. Bufonite, formerly regarded as a precious stone, and worn as a jewel. See Bufonite.