diphosphonate

noun

di·​phos·​pho·​nate (ˌ)dī-ˈfäs-fə-ˌnāt 

: bisphosphonate

The intermittent or continuous use of diphosphonates, which also have antiresorptive properties, may be no better than the use of estrogen or calcitonin.

—Robert Lindsay, The New England Journal of Medicine