fissile

Adjective

fissile (comparative more fissile, superlative most fissile)

1. Able to be split.
2. Easily split along a grain.
   • This Cryſtal is a pellucid fiſſile Stone, clear as Water or Cryſtal of the Rock, and without Colour; enduring a red Heat without loſing its tranſparency, and in a very ſtrong Heat calcining without Fuſion.a. 1728 (date written), Isaac Newton, “[The Third Book of Opticks.] [Qu[estion] 25. Are there not other original Properties of the Rays of Light, besides those already described?]”, in Opticks: Or, A...
3. 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 March 20, Jeffrey Lewis, “The Tunnels at Punggye-ri: An Alternative View”, in 38 North, archived from the original on 03 Apr 2014