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actinide

 
Dictionary: ac·ti·nide   (ăk'tə-nīd') pronunciation
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n.
Any of a series of chemically similar, radioactive elements with atomic numbers ranging from 89 (actinium) through 103 (lawrencium).

[ACTIN(IUM) + -IDE.]


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Britannica Concise Encyclopedia: actinide
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Any of the series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium (atomic numbers 89 – 103). All are radioactive heavy metals; and only the first four (actinium, thorium, protactinium, and uranium) occur in nature in appreciable quantities. The other 11 (the transuranium elements) are unstable and are produced only artificially. Actinides are transition elements, so their atoms have similar configurations and similar physical and chemical behaviour; the most usual valences are 3 and 4.

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Medical Dictionary: ac·ti·nide
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(ăk'tə-nī'd)
n.

Any of a series of chemically similar radioactive elements with atomic numbers ranging from 89 (actinium) through 103 (lawrencium).

WordNet: actinide
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Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: any of a series of radioactive elements with atomic numbers 89 through 103
  Synonyms: actinoid, actinon

 
 
Learn More
neptunium (chemistry)
transactinide elements (in chemistry)
berkelium (chemistry)

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved.  Read more
Medical Dictionary. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.  Read more
WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more