fissile

adjective3

1. •
   Able to be split.
2. •
   Capable of sustaining a nuclear fission chain reaction.

   • North Korea may soon have access to regular amounts of fissile material if it doesn’t already and could be preparing Punggye-ri for a number of nuclear tests if the above analysis is correct. — 2014
3. •
   Easily split along a grain.