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Adjective: fissile  fi-sul or 'fi,sI(-u)l [N. Amer], 'fi,sI(-u)l [Brit]
  1. (physics) capable of undergoing nuclear fission
    "a fissile nucleus";
    - fissionable
  2. Capable of being split, cleft or divided in the direction of the grain
    "fissile crystals"; "fissile wood"

Antonym: nonfissile

Encyclopedia: Fissile