Definition of actinide
: any of the series of elements with increasing atomic numbers that begins with actinium or thorium and ends with lawrencium — see periodic table table
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Recent Examples of actinide from the Web
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Uranium is currently the actinide of choice for the industry, used (sometimes with a little plutonium) in 100 percent of the world’s commercial reactors.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'actinide'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of actinide
International Scientific Vocabulary
First Known Use: 1945
Learn More about actinide
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Britannica.com: Encyclopedia article about actinide
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