lithotome

1. (surgery, archaic) An instrument used for cutting the bladder to remove a calculus; a cystotome. [from 18th c.]archaic

2. A mineral resembling a cut gem, formed that way by nature. [from 19th c.]Examples: "On the walls of these stupendous structures is written and sculptured the history, as well as the religion, of Egypt, from Osirtasen I., who reigned four thousand five hundred years ago, down to the Roman Augustus: these are the earliest and the latest names inscribed on the lithotomes of Karnak."; "The marble books of Egypt, the lithotomes and chiselled pictures of Assyria, are stamped with the minutest details of life—of busy, active, cultivated life, that was powerful in its day, and wrought mighty changes, and achieved mighty conquests in the almost forgotten ages of the long, long past."; "You know I'm something of a lithologist and I find the character and the science of the stones most interesting. I have seen some wonderful lithotomes about, too."