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See more synonyms for radioiron on Thesaurus.com
noun Chemistry.
  1. 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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Origin of radioiron

First recorded in 1955–60; radio- + iron
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018