toadstone

== English == === Etymology === From toad +‎ stone. === Noun === toadstone (countable and uncountable, plural toadstones) A small stone, once believed to be a jewel embedded in the head of a toad, worn as an amulet. (geology) A soft, earthy variety of trap-rock of a brownish-grey colour, looking like an argillaceous deposit. ==== Translations ====