ETIDRONATE

noun Etymology: etidronic acid (of which ~ is a salt), perhaps from ethylidene (the radical CH3CH) + hydr- + phophonic acid (an acid obtained from phosphine) Date: 1971 a white sodium salt C 2 H 6 Na 2 O 7 P 2 that inhibits the formation, growth, and dissolution of hydroxyapatite crystals and is administered orally in the treatment of some bone diseases (as Paget's disease of bone)