Meaning of radioiron

ra•di•o•i•ron

Pronunciation: (rā"dē-ō-ī'urn), [key]
— n. Chem.
  1. the radioactive isotope of iron, with atomic weight 59 and a half-life of 46 days: used chiefly as a tracer in biochemistry.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.