A stone of varying forms and usually glassy with a naturally formed hole, which is often used as an amulet or bead.

plural of Adderall

plural of common death adder

simple past tense and past participle of add oil

plural of full adder

plural of half adder

plural of Kimberley death adder

plural of pit-adder

plural of puff adder

simple past tense and past participle of add one's twopenn'orth