strontium /stronˈshi-əm, -shəm or stronˈti-əm/

A yellow metallic element (symbol Sr; atomic no 38) found in celestite

stronˈtia noun

Its oxide

stronˈtian /-shi-ən/ noun

(loosely) strontium, strontia or strontianite

stronˈtianite noun

Its carbonate, an orthorhombic mineral (first found in 1790 near Strontian in NW Scotland)

stronˈtium-90 noun

A radioactive isotope of strontium, an important element in nuclear fallout

strontium unit noun

A measure of the concentration of strontium-90 in organic material (abbrev SU)

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