'nonfissionable' definitions:

Definition of 'nonfissionable'

(from WordNet)

adjective

Not capable of undergoing fission [ant: fissile, fissionable]

Definition of 'nonfissionable'

From: GCIDE

nonfissionable \nonfissionable\ adj. (Physics) not capable of undergoing fission[4]; -- of atoms or chemical elements. Opposite of fissionable. [WordNet 1.5]

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