definitions

actinide

[ ak-tuh-nahyd ]
/ ˈæk təˌnaɪd /

noun Chemistry.

any element of the actinide series.

Nearby words

actinic dermatitis, actinic elastosis, actinic granuloma, actinic keratosis, actinic ray, actinide, actinide series, actiniform, actinin, actinism, actinium

Origin of actinide

1940–45; actin- + -ide, on the model of lanthanide
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for actinide

actinide

/ (ˈæktɪˌnaɪd) /

noun

a member of the actinide seriesAlso called: actinon

Word Origin for actinide

C19: from actino- + -ide
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for actinide

actinide

[ ăk′tə-nīd′ ]

n.

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.

Science definitions for actinide

actinide

[ 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® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.