Definify.com
Webster 1913 Edition
Fissile
1.
Capable of being split, cleft, or divided in the direction of the grain, like wood, or along natural planes of cleavage, like crystals.
This crystal is a pellucid, fissile stone.
Sir I. Newton.
Webster 1828 Edition
Fissile
FIS'SILE
,Adj.
That may be split, cleft or divided in the direction of the grain, or of natural joints.
This crystal is a pellucid fissile stone.