Search Result for "nonfissionable": 
Wordnet 3.0

ADJECTIVE (1)

1. not capable of undergoing fission; 



The Collaborative International Dictionary of English v.0.48:

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


WordNet (r) 3.0 (2006):

nonfissionable
    adj 1: not capable of undergoing fission [ant: fissile,
           fissionable]