From non- + fissionable. <span class="searchmatch">nonfissionable</span> (not comparable) Not fissionable....
-able. fissionable Capable of undergoing nuclear fission; fissile. <span class="searchmatch">nonfissionable</span> fissionability unfissionable capable of undergoing nuclear fission;...
and to inactivate microorganisms. Combine fissionable material with <span class="searchmatch">nonfissionable</span> material. 2015, International Atomic Energy Agency, Performance Analysis...