There are 3 main definitions of uranium-238 in English:

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uranium-238 1

noun

The common naturally-occurring isotope of uranium, of mass number 238.
  • Uranium-238 forms about 99.3 per cent of natural uranium. Unlike uranium-235, it is unable to sustain a nuclear chain reaction, making it unsuitable for use in nuclear power or nuclear weapons. However, the isotope plutonium-239, which is fissile, can be produced by bombarding uranium-238 with low-energy neutrons.

Origin

1920s; earliest use found in London, Edinburgh and Dublin Philosophical Magazine.

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There are 3 main definitions of uranium-238 in English:

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uranium-235 2

noun

An isotope of uranium, mass number 235, which is able to sustain a nuclear chain reaction, making it suitable for use in nuclear power and nuclear weapons.
  • Natural uranium contains only about 0.72% uranium-235, and must be enriched before it can be used as a nuclear fuel or explosive.

Origin

1930s; earliest use found in Science News.

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There are 3 main definitions of uranium-238 in English:

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uranium 3 Line breaks: ur¦an|ium
Pronunciation: /jʊˈreɪnɪəm/

noun

[mass noun]
The chemical element of atomic number 92, a dense grey radioactive metal used as a fuel in nuclear reactors. (Symbol: U)
Example sentences
  • It is not possible, however, to construct weapons directly out of uranium or slightly enriched uranium.
  • All countries have uranium, uranium is a very common material around the world.
  • It is not certain if the effects are due to the chemical or the radioactive properties of uranium.

Uranium is a chemically reactive metal belonging to the actinide series. Becquerel discovered radioactivity in uranium in 1896, and its capacity to undergo fission led to its use as a source of energy, though the fissile isotope, uranium-235, has to be separated from the more common uranium-238 before it can be used in nuclear weapons. The atom bomb exploded over Hiroshima in 1945 contained uranium-235

Origin

Late 18th century: modern Latin, from Uranus: compare with tellurium.

More
  • A rare radioactive metal, uranium is found in the mineral pitchblende. The German chemist Martin Klaproth isolated the metal and called it uranium after the planet Uranus, which the astronomer Sir William Herschel had discovered less than a decade before, in 1781.

Words that rhyme with uranium

cranium, geranium, germanium, Herculaneum, titanium

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