fissile

adj. splittable, fissionable; cleavable

In nuclear engineering, a fissile material is one that is capable of sustaining a chain reaction of nuclear fission. All known fissile materials are capable of sustaining a chain reaction in which either thermal or slow neutrons  or fast neutrons predominate. That is, they can all be used to fuel:A thermal reactor, with a neutron moderatorA fast reactor, with no moderatorA nuclear explosive"Fissile" is distinguished from "fissionable". "Fissionable" are any materials with atoms that can undergo nuclear fission. "Fissile" is defined to be materials that are fissionable by neutrons with zero kinetic energy. "Fissile" thus, is more restrictive than "fissionable" — although all fissile materials are fissionable, not all fissionable materials are fissile. Some authorities even restrict the term fissionable to mean only non-fissile materials.
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Adjective
1. capable of undergoing nuclear fission; "a fissionable nucleous"; "fissionable material"
(synonym) fissionable
(classification) physics, physical science, natural philosophy
2. capable of being split or cleft or divided in the direction of the grain; "fissile crystals"; "fissile wood"
(antonym) nonfissile

adj. fissile, splittable, fissionable, capable of undergoing fission

adj. fissile, splittable, cleavable