The metallic chemical element (symbol Sr) with an atomic number of 38. It is a soft, reactive, silvery alkaline earth metal. / (countable) A single atom of this element.

plural of strontium

(physics) The radioactive isotope of strontium, ⁹⁰₃₈Sr, that is present in the fallout from nuclear explosions and, being chemically similar to calcium, is accumulated in the bones

(attributive) Designating a method of geological dating based on the relative amounts in rock of rubidium-87 and its beta-decay product, strontium-87.

(inorganic chemistry) A colorless solid with the formula Sr(NO₃)₂, used as a red colorant and oxidizer in pyrotechnics.