protactinium

noun
prot·​ac·​tin·​i·​um | \ ˌprō-ˌtak-ˈti-nē-əm How to pronounce protactinium (audio) \

Definition of protactinium

: a shiny radioactive metallic element of relatively short life — see Chemical Elements Table

First Known Use of protactinium

1918, in the meaning defined above

History and Etymology for protactinium

New Latin

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The first known use of protactinium was in 1918

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Cite this Entry

“Protactinium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/protactinium. Accessed 24 Sep. 2020.

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More Definitions for protactinium

protactinium

noun
prot·​ac·​tin·​i·​um | \ ˌprōt-ˌak-ˈtin-ē-əm How to pronounce protactinium (audio) \
variants: also protoactinium \ ˌprōt-​ō-​ How to pronounce protoactinium (audio) \

Medical Definition of protactinium

: a shiny metallic radioelement of relatively short life symbol Pa — see Chemical Elements Table

More from Merriam-Webster on protactinium

Britannica.com: Encyclopedia article about protactinium

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