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actinium

noun

ac·​tin·​i·​um ak-ˈti-nē-əm How to pronounce actinium (audio)
: a radioactive trivalent metallic element that resembles lanthanum in chemical properties and that is found especially in pitchblende see Chemical Elements Table

Example Sentences

Recent Examples on the Web Other theorists have predicted that hydrides such as calcium hydride or actinium hydride should superconduct at close to room temperature—and at a pressure considerably less than that needed for CSH. Robert F. Service, Science | AAAS, 26 Aug. 2021

Word History

Etymology

borrowed from French, from Greek aktīn-, aktís "ray, beam" + -ium -ium; so called from its radioactivity — more at actin-

First Known Use

1900, in the meaning defined above

Time Traveler
The first known use of actinium was in 1900

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