Definition of fissile adjective from the Oxford Advanced Learner's Dictionary

 

fissile

 adjective
adjective
BrE BrE//ˈfɪsaɪl//
 
; NAmE NAmE//ˈfɪsl//
 
(physics) Energy and physical forces
 
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capable of nuclear fission fissile material See related entries: Energy and physical forces Word Origin mid 17th cent. (in the sense ‘easily split’): from Latin fissilis, from fiss- ‘split, cracked’, from the verb findere.
See the Oxford Advanced American Dictionary entry: fissile