noun Chemistry.
any element of the actinide series.

1940–45; actin- + -ide, on the model of lanthanide Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
actinide (ˈæktɪˌnaɪd)
Also called: actinon a member of the actinide series
[C19: from actino- + -ide]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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).

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
actinide   (āk'tə-nīd')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
And if you pack together enough of certain actinide atoms, their nuclei will erupt in a powerful release of energy.
The actinide series derives its name from the first element in the series, actinium.
New methods were implemented to improve the actinide method for urine.
The first step of this modeling is a proper description of the actinide complex.
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