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[rey-dee-oh-soh-dee-uh m]
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noun Chemistry.
  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.

Origin of radiosodium

First recorded in 1930–35; radio- + sodium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
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