There are 3 main definitions of uranium in English:

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uranium 1

Syllabification: u·ra·ni·um
Pronunciation: /yo͝oˈrānēəm/

noun

The chemical element of atomic number 92, a gray, dense radioactive metal used as a fuel in nuclear reactors. (Symbol: U)

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

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.

Origin

Late 18th century: modern Latin, from Uranus + -ium.

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

Definition of uranium in:

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There are 3 main definitions of uranium in English:

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uranium-235 2

Entry from British & World English dictionary

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 in English:

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uranium-238 3

Entry from British & World English dictionary

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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