[ rey-dee-oh-ahy-ern ]
/ ˌreɪ di oʊˈaɪ ərn /
the radioactive isotope of iron, with atomic weight 59 and a half-life of 46 days: used chiefly as a tracer in biochemistry.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020