Meanings
nounactinide (plural actinides)
plural actinides
- chemistryAny 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.
- chemistryAny 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).
- datedchemistryAny 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).
Synonyms & antonyms
nounany of a series of radioactive elements with atomic numbers 89 through 103
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
- Ancient Greekᾰ̓κτῑ́ς (ăktī́s)
- Englishactino-
- Englishactin-
- Proto-Indo-European*dʰeh₁-
- Englishactinide
Translations
Afrikaans aktinied
- aktiniedone of a group of radioactive elements
Catalan actínid
- actínidone of a group of radioactive elements
Chinese Mandarin 錒系元素 /锕系元素
- 錒系元素 /锕系元素 (āxì yuánsù)one of a group of radioactive elements
Czech aktinid, aktinoid
- aktinidone of a group of radioactive elements
- aktinoidone of a group of radioactive elements
Finnish aktinoidi
- aktinoidione of a group of radioactive elements
German Actiniden
- Actinidenone of a group of radioactive elements
Greek ακτινίδιο
- ακτινίδιο (aktinídio)one of a group of radioactive elements
Hindi एजातेय
- एजातेय (ejātey)one of a group of radioactive elements
Hungarian aktinoida
- aktinoidaone of a group of radioactive elements
Italian attinoide
- attinoideone of a group of radioactive elements
Japanese アクチノイド
- アクチノイド (akuchinoido)one of a group of radioactive elements
Polish aktynowiec
- aktynowiecone of a group of radioactive elements
Romanian actinid
- actinidone of a group of radioactive elements
Spanish actínido
- actínidoone of a group of radioactive elements
Rhymes & wordplay
Anagrams
Cite this entry
APA
actinide. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/actinide
MLA
“actinide.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/actinide. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “actinide,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/actinide.
Source: actinide on Wiktionary, CC BY-SA 4.0.