Adjective
Capable of being split, cleft, or divided in the direction of the grain, like wood, or along natural planes of cleavage, like crystals.
Source: Webster's dictionaryThe part of uranium that's fissile - when you hit it with a neutron, it splits in two - is about 0.7%. The reactors we have today are burning that 0.7%. Bill Gates
We estimate that once Iraq acquires fissile material - whether from a foreign source or by securing the materials to build an indigenous fissile material capability - it could fabricate a nuclear weapon within one year. John R. Bolton
fissile crystals Source: Internet
fissile wood Source: Internet
a fissionable nucleous Source: Internet
fissionable material Source: Internet