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Adder-stone, a perforated stone, imagined by the vulgar to be made by the sting of an adder. Stones of this kind are suspended in stables as a charm to secure the horses from being hag-ridden; and are also hung up at the bed’s head, to prevent the night-mare. See Holy-stones.

Source: Brockett John Trotter. A Glossary of North Country Words in use with Etymology and affinity to other languages and occasional Notices of Local Customs and Popular Superstitions. Printed Newcastle upon Tyne 1829.