Toadstone \Toad"stone`\, n.
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.
[1913 Webster]
2. Bufonite, formerly regarded as a precious stone, and worn
as a jewel. See {Bufonite}.
[1913 Webster]