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 (fĭs′əl, -īl′)
1. Possible to split.
2. Physics Fissionable, especially by neutrons of all energies.
3. Geology Easily split along close parallel planes.

[Latin fissilis, from fissus, split; see fissi-.]

fis·sil′i·ty (fĭ-sĭl′ĭ-tē) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Nuclear Physics) Brit capable of undergoing nuclear fission as a result of the impact of slow neutrons
2. (General Physics) US and Canadian another word for fissionable
3. tending to split or capable of being split
[C17: from Latin fissilis, from fissus split; see fissi-]
fissility n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈfɪs əl)

1. capable of being split or divided.
2. fissionable.
[1655–65; < Latin fissilis easily split]
fis•sil′i•ty, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.fissile - capable of undergoing nuclear fission; "a fissionable nucleous"; "fissionable material"
natural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"
2.fissile - capable of being split or cleft or divided in the direction of the grain; "fissile crystals"; "fissile wood"
nonfissile - not fissile
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


[ˈfɪsaɪl] ADJfísil
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


adjspaltbar; fissile materialSpaltmaterial nt
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
References in periodicals archive ?
Some of the waste buried underneath the dome includes debris of plutonium-239, a fissile isotope and one of the most toxic substances on earth that has a half-life of 24,000 years which is used in nuclear reactors.
American scientists and experts, as pioneers in the nuclear arms race, went the hard way: they simultaneously created two fundamentally different models of atomic bombs--<<uranium>> based on the fissile uranium isotope [92.sup.235]U and <<plutonium>> based on the fissile isotope of plutonium [94.sup.239]Pu [2- 9].
Centrifuges spin at supersonic speed to increase the ratio of the fissile isotope in uranium.
The parameters also state that "Iran will not use its IR-2, IR-4, IR-5, IR-6, or IR-8 models to produce enriched uranium" during this period, and that it will "engage in limited research and development with its advanced centrifuges, according to a schedule and parameters which have been agreed to by the P5+1." In addition, the amount of low-enriched stock that Iran can retain is capped at 300 kilograms of 3.67 percent-enriched uranium for the next fifteen years (i.e., uranium that contains 3.67 percent of the fissile isotope U235).
Centrifuges are machines that spin at supersonic speed to increase the ratio of the fissile isotope in uranium.
The most controversial part of Iran's nuclear program has been its enrichment of uranium, which is first turned into a gas and then spun at high speeds in centrifuges to increase the concentration of the fissile isotope that is needed to make either fuel for a reactor or the core of an atomic bomb.
In September, Israeli Prime Minister Benjamin Netanyahu said Israel would not let Iran acquire enough material for a bomb; enriching uranium raises the less than one percent of fissile isotope U-235 found in mined metal to higher concentrations: about 4 percent for reactor fuel, up to 90 percent for a bomb.
Drawbacks to this approach include the increased demand for fissile material (higher levels of enrichment would be required for their fuel), which might dictate future construction of reactors specifically for fissile isotope production and associated isotope separation plants.