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Capable of undergoing nuclear fission; fissile. examples
plural fissionables
Any fissile or fissionable substance. quotations examples
If one nation seized the fissionables within its borders, this would “serve as a danger signal” to other nations. The wrongdoer's gain would be short-lived because other nations would take defensive action in kind.
1956, Bulletin of the Atomic Scientists, volume 12, number 4, page 106