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Actinide

//ˈæktɪnaɪd// noun

Definitions

Noun
  1. 1
    Any of the 15 radioactive elements of the periodic table from actinium to lawrencium that are positioned under the lanthanides, to which they have similar chemistry.
  2. 2
    any of a series of radioactive elements with atomic numbers 89 through 103 wordnet
  3. 3
    Any of the 14 elements from actinium to nobelium (lawrencium is excluded by some authors as it is a d-block rather than an f-block element).
  4. 4
    Any of the 14 elements from thorium to lawrencium (actinium having been mistakenly excluded because it was thought to be a d-block element in the past). dated

Etymology

From actin- + -ide.

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