- capable of being split or divided; cleavable.
- (of a nuclide) capable of undergoing fission induced by low-energy neutrons, as uranium 233 and 235.
- British capable of undergoing nuclear fission as a result of the impact of slow neutrons
- US and Canadian another word for fissionable
- tending to split or capable of being split
adj.1660s, from Latin fissilis “that which may be cleft or split,” from fissus, past participle of findere (see fissure).