Word.ws English Dictionary

actinides

actinides is the plural of actinide.

Meaning of actinide

Noun

actinide (plural actinides)

  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. 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. (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).

Questions about actinides

What is actinides the plural of?
Actinides is the plural of actinide.

Words near actinides in the dictionary

  1. actinic keratoses
  2. actinic keratosis
  3. actinically
  4. actinidain
  5. actinide
  6. actinides
  7. actinidiaceous
  8. actinidic
  9. actinidic acid
  10. actinidin
  11. actinidine

Source and license

Adapted from Wiktionary: actinides (page history and authors); actinide (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “actinides.” Word.ws, https://word.ws/actinides. Based on Wiktionary, CC BY-SA 4.0.