actinide
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ac·ti·nide
(ăk′tə-nīd′)n.
Any of a series of chemically similar, radioactive elements with atomic numbers ranging from 89 (actinium) through 103 (lawrencium). Also called actinoid.
[actin(ium) + -ide.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
actinide
(ˈæktɪˌnaɪd)n
(Elements & Compounds) a member of the actinide series. Also called: actinon
[C19: from actino- + -ide]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ac•ti•nide
(ˈæk təˌnaɪd)n.
any element of the actinide series.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ac·ti·nide
(ăk′tə-nīd′) 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® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Noun | 1. | actinide - any of a series of radioactive elements with atomic numbers 89 through 103 |
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