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fissionable

[fish-uh-nuh-buh l]
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adjective Physics.
  1. capable of or possessing a nucleus or nuclei capable of undergoing fission: a fissionable nucleus; fissionable material.
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Also fissile.

Origin of fissionable

First recorded in 1940–45; fission + -able
Related formsfis·sion·a·bil·i·ty, nounnon·fis·sion·a·ble, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for fissionability

fissionable

adjective
  1. capable of undergoing nuclear fission as a result of any processCompare fissile (def. 1)
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Derived Formsfissionability, 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