A a


    • US Pronunciation
    • US IPA
    • [ak-tuh-nahyd]
    • /ˈæk təˌnaɪd/
    • US Pronunciation
    • US IPA
    • [ak-tuh-nahyd]
    • /ˈæk təˌnaɪd/

Definitions of actinide word

  • noun actinide a member of the actinide series 3
  • noun actinide 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 3
  • noun actinide any element of the actinide series. 1
  • noun actinide Any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103) in the periodic table. They are all radioactive, the heavier members being extremely unstable and not of natural occurrence. 1
  • noun actinide (inorganic chemistry) Any of the 14 radioactive elements of the periodic table that are positioned under the lanthanides to which they have similar chemistry. 0

Information block about the term

Origin of actinide

First appearance:

before 1940
One of the 7% newest English words
1940-45; actin- + -ide, on the model of lanthanide

Historical Comparancy

Parts of speech for Actinide


actinide popularity

A common word. It’s meaning is known to most children of preschool age. About 74% of English native speakers know the meaning and use the word.
This word is included in each student's vocabulary. Most likely there is at least one movie with this word in the title.

actinide usage trend in Literature

This diagram is provided by Google Ngram Viewer

Top questions with actinide

  • what elements are in the actinide series?
  • what is actinide contraction?
  • what does actinide mean?
  • what is an actinide?
  • what is the actinide series?
  • what is actinide series?
  • which actinide is used in some smoke detectors?
  • which of the following is true about the actinide series?

See also

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