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Meaning of plutonium

plu•to•ni•um

Pronunciation: (pl-tō'nē-um), [key]
— n. Chem., Physics.
  1. a transuranic element with a fissile isotope of mass number 239that can be produced from non-fissile uranium 238, as in a breeder reactor. Symbol: Pu; at. no.: 94.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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