'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]