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Meaning of radiosodium

ra•di•o•so•di•um

Pronunciation: (rā"dē-ō-sō'dē-um), [key]
— n. Chem.
  1. the radioactive isotope of sodium having an atomic mass of 24 and a half-life of 14.9 hours: used as a tracer in biochemistry.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.