toadstone noun2 •A small stone, once believed to be a jewel embedded in the head of a toad, worn as an amulet. •A soft, earthy variety of trap-rock of a brownish-grey colour, looking like an argillaceous deposit.Rowley-Rag appeared to be the same thing as basalt and toadstone resembled some species of lava. — 2004 formstoadstones
