uranium 238

uranium 238

 
noun Chemistry.
the radioactive uranium isotope having a mass number 238, comprising 99.28 percent of natural uranium: used chiefly in nuclear reactors as a source of the fissionable isotope plutonium 239.
Also called U-238, U 238.

Origin:
1940–45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Uranium 238 is always a great word to know.
So is glacial. Does it mean:
of, pertaining to, or tending to develop into icelike crystals: glacial phosphoric acid
any of a number of polymers containing alternate silicon and oxygen atoms and that are fluid, resinous, rubbery, extremely stable in high temperatures, and water-repellent
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WordNet
uranium 238

noun
the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239 
WordNet® 3.0, © 2006 by Princeton University.
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