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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. Newton. [1913 Webster] 2. Fissionable. [PJC]