
1) Able to be split 2) Cleavable 3) Fissionable 4) Splittable
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https://www.crosswordclues.com/clue/fissile

1) Fissionable
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https://www.crosswordclues.com/clue/fissile

easily split
Found on
http://orchidfetish.com/glossary.html

• (a.) Capable of being split, cleft, or divided in the direction of the grain, like wood, or along natural planes of cleavage, like crystals.
Found on
http://thinkexist.com/dictionary/meaning/fissile/

Easily split along parallel layers.
Found on
http://www.encyclo.co.uk/local/22291
Fis'sile adjective [ Latin
fissilis , from
fissus , past participle of
findere to split. See
Fissure .] 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,...
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http://www.encyclo.co.uk/webster/F/34

easily split
Found on
http://www.orchidspecies.com/glossary.htm

[
adj] - capable of being split or cleft or divided in the direction of the grain
Found on
http://www.webdictionary.co.uk/definition.php?query=fissile
adjective capable of being split or cleft or divided in the direction of the grain; `fissile crystals`; `fissile wood`
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https://www.encyclo.co.uk/local/20974

capable of being split or divided; cleavable. · · fissionable. · (of a nuclide) capable of undergoing fission induced by low-energy neutrons, as uranium 233 and 235.
Found on
https://www.infoplease.com/dictionary/fissile
(of an isotope) Capable of capturing a slow (thermal) neutron and undergoing nuclear fission, e.g. U-235, U-233, Pu-239.
Found on
https://www.world-nuclear.org/nuclear-basics/glossary.aspx
No exact match found.