Actinide Definition
ăktə-nīd
noun
Any of a series of chemically similar, radioactive elements with atomic numbers ranging from 89 (actinium) through 103 (lawrencium).
American Heritage
Any of the elements in the series (actinide series) of radioactive, metallic chemical elements from element 89 (actinium) through element 103 (lawrencium): actinides resemble lanthanides in electronic structure.
Webster's New World
(inorganic chemistry) Any of the 14 radioactive elements of the periodic table that are positioned under the lanthanides to which they have similar chemistry.
Wiktionary
Other Word Forms of Actinide
Noun
Singular:
actinide
Plural:
actinidesOrigin of Actinide
actin(ium) –ide
From American Heritage Dictionary of the English Language, 5th Edition
actin- + -ide
From Wiktionary
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