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Definition of Strontium

Medically reviewed by Min Clinic Staff | Updated: January 2026

Strontium: An earth element and metal with atomic no. 38, atomic wt. 87.62 that is used in a radioactive form for imaging tests and as a treatment for cancer. First detected in lead mines near Strontian, Scotland, strontium is present in water and food and, in trace amounts, the human skeleton.