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neptunium

noun
nep·​tu·​ni·​um | \ nep-ˈtü-nÄ“-É™m How to pronounce neptunium (audio) , -ˈtyü-\

Definition of neptunium

: a radioactive metallic element that is chemically similar to uranium and is obtained in nuclear reactors especially as a by-product in the production of plutonium — see Chemical Elements Table

Examples of neptunium in a Sentence

Recent Examples on the Web

 Sometime in 2017, the radioactive element neptunium 237 was also detected near the school. — The Cincinnati Enquirer, Cincinnati.com, "Officials: Retest of samples shows enriched uranium in Pike County school," 26 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'neptunium.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of neptunium

1941, in the meaning defined above

History and Etymology for neptunium

New Latin, from International Scientific Vocabulary Neptune

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More Definitions for neptunium

neptunium

noun
nep·​tu·​ni·​um | \ nep-ˈtü-nÄ“-É™m How to pronounce neptunium (audio) , -ˈtyü-\

Kids Definition of neptunium

: a radioactive chemical element similar to uranium

neptunium

noun
nep·​tu·​ni·​um | \ nep-ˈt(y)ü-nÄ“-É™m How to pronounce neptunium (audio) \

Medical Definition of neptunium

: a radioactive metallic element that is chemically similar to uranium and is obtained in nuclear reactors as a by-product in the production of plutonium —symbol Np — see Chemical Elements Table

More from Merriam-Webster on neptunium

Britannica.com: Encyclopedia article about neptunium

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