[fish-uh-nuh-buh l]

adjective Physics.

capable of or possessing a nucleus or nuclei capable of undergoing fission: a fissionable nucleus; fissionable material.

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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for fissionable


Examples from the Web for fissionable

Historical Examples of fissionable

  • "There are, or were, three chief sources of fissionable ores," Harkaman said.

    Space Viking

    Henry Beam Piper

  • The fissionable material was too valuable for other purposes.

  • Do you know why that planet was so extensively colonized by the Federation, when there don't seem to be any fissionable ores?

    Space Viking

    Henry Beam Piper

  • Both uranium 235 and plutonium are fissionable and can be used to produce an atomic explosion.

    Trinity [Atomic test] Site

    White Sands Missile Range Public Affairs Office

  • What makes the whole thing terrible is that the freighter is loaded with fissionable material exported from Ganymede.

    Jack of No Trades

    Charles Cottrell

British Dictionary definitions for fissionable



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