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say it: FIS-uhl
fissile is an adjective meaning "capable of undergoing nuclear fission". It carries 2 recorded senses.
capable of undergoing nuclear fission
“a fissionable nucleous”
“fissionable material”
physics
capable of being split or cleft or divided in the direction of the grain
“fissile crystals”
“fissile wood”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for fissile come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.