actinide

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English

Etymology

actin- +‎ -ide

Pronunciation

  • enPR: ăk'tĭnīd, IPA(key): /ˈæktɪnaɪd/
  • Audio (Southern England)(file)

Noun

actinide (plural actinides)

  1. (chemistry) 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. (chemistry) 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).
  3. (chemistry) (dated) 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).

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French

Pronunciation

Noun

actinide m (plural actinides)

  1. actinide
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