[Alteration of obsolete lithotriptor, lithontriptor, from lithontriptic, breaking up kidney stones, from New Latin lithontripticus, alteration (influenced by Greek trībein, trīp-, to rub, pound) of lithonthrypticus, from Greek (pharmaka tōn en nephrōis) lithōn thruptika, (drugs) crushing stones (in the kidneys) : lithōn, genitive pl. of lithos, stone + thruptika, neuter pl. of thruptikos, crushing (from thruptein, to crush; see dhreu- in the Appendix of Indo-European roots).]