Definition of fissile in English:


Line breaks: fis|sile
Pronunciation: /ˈfɪsʌɪl


  • 1(Of an atom or element) able to undergo nuclear fission: a fissile isotope
    More example sentences
    • It resumed the production, and testing of uranium enrichment centrifuges that can make fissile material for nuclear reactors or weapons.
    • It also is the toxic and radioactive byproduct of enriched uranium, the fissile material in nuclear weapons.
    • As a general rule, however, the biggest hurdle for a would-be nuclear power is the acquisition of fissile material - enriched uranium or plutonium.
  • 2(Chiefly of rock) easily split: flat-bedded and very highly fissile shale
    More example sentences
    • For example, fissile slates tend to yield much flatter particles than massive granites.
    • This horizon, up to 1.3 m thick, is a black, highly fissile shale.
    • The fossiliferous horizons occur in greenish to greyish siltstones and brown to black fissile shales associated with mollusc shells.



Pronunciation: /-ˈsɪlɪti/
More example sentences
  • During compaction of siliciclastic muds the flaky clay particles are realigned to be parallel to each other and impart a fissility (a direction of easy splitting) to the rock, which is commonly called shale.


mid 17th century (in the sense 'easily split'): from Latin fissilis, from fiss- 'split, cracked', from the verb findere.

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