From The Collaborative International Dictionary of English v.0.48:

Fissile \Fis"sile\, a. [L. fissilis, fr. fissus, p. p. of
   findere to split. See Fissure.]
   1. Capable of being split, cleft, or divided in the direction
      of the grain, like wood, or along natural planes of
      cleavage, like crystals.
      [1913 Webster]

            This crystal is a pellucid, fissile stone. --Sir I.
      [1913 Webster]

   2. Fissionable.
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