Protium can be any of several things: In chemistry, protium refers to hydrogen-1, the most common isotope of the element hydrogen, with one proton and no neutrons Protium (plant), a genus of chiefly tropical American trees in the family Burseraceae, having fragrant wood Protium (computer language), a universal, symbolic programming language system In medicine, Protium is a commercial name for pantoprazole, a proton inhibitor drug… (More on Protium)