Etymology
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fissile (adj.)

1660s, from Latin fissilis "that which may be cleft or split," from fissus, past participle of findere "cleave, split, separate, divide" (from PIE root *bheid- "to split").

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Definitions of fissile

fissile (adj.)
capable of being split or cleft or divided in the direction of the grain;
fissile wood
fissile crystals
fissile (adj.)
capable of undergoing nuclear fission;
Synonyms: fissionable
From wordnet.princeton.edu