'Toadstone' definitions:

Definition of 'Toadstone'

From: GCIDE

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]