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[fish-uh-nuh-buh l] /ˈfɪʃ ə nə bəl/
adjective, Physics.
capable of or possessing a nucleus or nuclei capable of undergoing fission:
a fissionable nucleus; fissionable material.
Also, fissile.
1940-45; fission + -able
Related forms
fissionability, noun
nonfissionable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for fissionable
  • Packed inside the zirconium cladding are pellets of uranium oxide or other fissionable materials.
  • The fissionable material is degrading all the time and after several years they will no longer be sufficient to be fissile.
  • They create plutonium which is highly fissionable and highly desired by any country trying to develop a nuclear weapon.
  • Each cell could contain a tiny speck of fissionable material, or the cells could cluster in a colony around a source.
  • The others are too fissionable or not fissionable enough.
  • fissionable nuclear fuel is a non-renewable resource.
  • In a fission chain reaction, a fissionable nucleus absorbs a neutron and fissions spontaneously, releasing additional neutrons.
  • Nuclear explosions cannot occur in conventional reactors because the density of fissionable material is too low.
  • Modeling of the nuclear fuel permits a cross-flow of fissionable material between various reactors in a continuous fashion.
  • fissionable as well as non-fissionable media can be treated.
British Dictionary definitions for fissionable


capable of undergoing nuclear fission as a result of any process Compare fissile (sense 1)
Derived Forms
fissionability, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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