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Meaning of fissionable

fis•sion•a•ble

Pronunciation: (fish'u-nu-bul), [key]
— adj. Physics.
  1. capable of or possessing a nucleus or nuclei capable of undergoing fission: a fissionable nucleus; fissionable material.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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