actinide

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Definitions from WordNet

Noun actinide has 1 sense

actinoid, actinide, actinon - any of a series of radioactive elements with atomic numbers 89 through 103
--₁ is a kind of group, grouping

Definitions from the Web

Actinide

Definition: A series of chemical elements in the periodic table characterized by the filling of the 5f electron shell. These elements are all radioactive and are dense metals with similar physical and chemical properties.

Noun

Sense: A group of metallic elements in the periodic table.

Example Sentence: Uranium is an actinide that is commonly used as fuel in nuclear reactors.

Adjective

Sense: Relating to or characteristic of actinides.

Example Sentence: The actinide series spans from atomic number 89 (actinium) to 103 (lawrencium).