uraĀ·niĀ·um
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Definition of uranium
: a silvery heavy radioactive polyvalent metallic element that is found especially in uraninite and exists naturally as a mixture of mostly nonfissionable isotopes ā see Chemical Elements Table
Examples of uranium in a Sentence
Recent Examples on the Web
In recent months, Iran has taken steps to suspend some of its commitments to the nuclear deal, easing restrictions on uranium enrichment. — Artemis Moshtaghian And Sarah El Sirgany, CNN, "Iran is releasing seven Indian crew members from seized UK tanker," 4 Sep. 2019 South Dakota Rapid City: Federal regulators are holding a hearing on a uranium mine proposal that could help resolve a long-running dispute over the potential impact on places of Native American cultural, historical and religious significance. — USA TODAY, "Record grapefruit, light rail win, Snake Road: News from around our 50 states," 29 Aug. 2019 Iran recently surpassed the uranium enrichment limit set by this deal, adding to global apprehension. — Renae Reints, Fortune, "In a Debate Over Differences, Hereās What Was Left Off the Table," 31 July 2019 In another, the EPA revoked a rule protecting groundwater near certain uranium mines. — Jane C. Timm, NBC News, "Fact check: Trump misleads on tackling lead in drinking water," 9 July 2019 Anecdotal connections to the hundreds of uranium mines that operated for decades on the Navajo Nation before being abandoned in the 1980s were part of the push for the cancer treatment center, Bonar said. — Washington Post, "New Navajo Nation cancer center cuts patientsā travel time," 27 June 2019 On Sunday, Trump said the idea of buying Greenland has been discussed in his administration because of the strategic benefits and in part because of its natural resources, including coal and uranium. — Martin Selsoe Sorensen, BostonGlobe.com, "In Denmark, bewilderment and anger over Trumpās canceled visit," 21 Aug. 2019 Investors in Greenland have requested permits to open rare-earth and uranium mines that would be among the largest in the world. — The Economist, "A polarising president: Donald Trump wants to buy Greenland," 16 Aug. 2019 Einstein urged the United States to stockpile uranium ore and begin work on its own atomic weapons. — Trevor Lipscombe, Time, "Einstein Feared a Nazi Atom BombāBut Immigrants Made Sure the U.S. Got There First," 2 Aug. 2019These example sentences are selected automatically from various online news sources to reflect current usage of the word 'uranium.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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More Definitions for uranium
uranium
noun
English Language Learners Definition of uranium
: a radioactive element that is used to make nuclear energy and nuclear weapons
See the full definition for uranium in the English Language Learners Dictionary
uranium
noun
uraĀ·niĀ·um
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Kids Definition of uranium
: a radioactive metallic chemical element used as a source of atomic energy
uranium
noun
uraĀ·niĀ·um
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Medical Definition of uranium
: a silvery heavy radioactive polyvalent metallic element that is found especially in pitchblende and uraninite and exists naturally as a mixture of three isotopes of mass number 234, 235, and 238 in the proportions of 0.006 percent, 0.71 percent, and 99.28 percent respectively
—symbol U
ā see Chemical Elements Table
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