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fissile

adjective
 
 
/ˈfɪs.aɪl/ US  /-əl/ specialized

Definition

(of rock) able to be divided easily into pieces: Because of its layered structure, mica is fissile.Fragile and breakable (of atoms) able to produce nuclear fission: An amount of fissile material went missing as a result of the accident.Atoms, molecules and sub-atomic particles
(Definition of fissile adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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