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thorium series: Meaning and Definition of

tho'rium se"ries

Pronunciation: [key]
— Chem. Chem.
  1. the radioactive series that starts with thorium and ends with a stable isotope of lead of mass number 208.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
thorium thorn
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