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The Collaborative International Dictionary of English v.0.48 (gcide)

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.
Newton.
[1913 Webster]

2. Fissionable.
[PJC]