Definition of strontium in US English:



  • The chemical element of atomic number 38, a soft silver-white metal of the alkaline earth series. Its salts are used in fireworks and flares because they give a brilliant red light.

    • ‘ARS developed methods using calcium to remove strontium - 90 radioactivity from wheat and milk in 1962.’
    • ‘The Scottish village is Strontia and the element is the alkaline earth metal strontium.’
    • ‘The scattering response of the system is not identical for calcium and strontium.’
    • ‘Because of its chemical closeness to calcium, strontium can comfortably replace the lighter element in enamel, dentin, and bone.’
    • ‘Plants incorporate strontium in place of calcium but the amount is determined by the relative abundance of these elements in the soil.’


Early 19th century: from strontia + -ium.