any element of the .
a member of the actinide series Also called actinon

actinide ac·ti·nide (āk’tə-nī’d)
Any of a series of chemically similar radioactive elements with atomic numbers ranging from 89 (actinium) through 103 (lawrencium).
Any of a series of chemically similar metallic elements with atomic numbers ranging from 89 (actinium) to 103 (lawrencium). All of these elements are radioactive, and two of the elements, uranium and plutonium, are used to generate nuclear energy. See Periodic Table.


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  • Actinide series

    the series of radioactive elements that starts with actinium and ends with lawrencium. noun a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium

  • Actiniform

    having a radiate form. Historical Examples The animals are actiniform, furnished with numerous cleft tentacula, in the centre of which is the polygonal mouth. The Ocean World: Louis Figuier adjective another word for actinoid

  • Actinin

    a contractile protein of muscle.

  • Actinism

    the property of radiation by which chemical effects are produced. Historical Examples In summer, when the maturing process advances, light and heat increase, and actinism relatively declines. The Reason Why Anonymous In the autumn, when the ripening period arrives, light and actinism give way to a greater ratio of heat. The Reason Why Anonymous The […]

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