actinoid

A1C3T1I1N1O1I1D2
/ˈæktɪnɔɪd/

noun

actinide

Similar
actinomorphicactinomorphousactinideactinon
OriginAncient Greek εἶδος (eîdos) ← Proto-Hellenic *wéidos ← Proto-Indo-European *wéydos →
Scrabble 11
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Meanings

nounactinoid (plural actinoids)

plural actinoids

  1. chemistryactinide
adjective
  1. Having the form of rays; radiated, as in the species of the family Actiniidae.

Synonyms & antonyms

adjectivehaving a radial form

Similar
actinomorphicactinomorphous

nounany of a series of radioactive elements with atomic numbers 89 through 103

Similar
actinideactinon
Broader
groupgrouping
Also see
actinideactinomorphicactinomorphousactinon

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Ancient Greekᾰ̓κτῑ́ς (ăktī́s)
  2. Englishactino-
  3. Englishactin-
  4. Proto-Indo-European*weyd-
  5. Proto-Indo-European*wéydos
  6. Proto-Hellenic*wéidos
  7. Ancient Greekεἶδος (eîdos)
  8. Englishactinoid

From actin- + -oid.

Full word history & related roots →

Translations

German Aktinoid
  • Aktinoidactinide
Italian attinoide
  • attinoideactinide
Japanese アクチノイド
  • アクチノイド (akuchinoido)actinide

Rhymes & wordplay

Anagrams

diatonicdicationacontiidnaticoid
Cite this entry
APA

actinoid. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/actinoid

MLA

“actinoid.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/actinoid. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “actinoid,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/actinoid.

Source: actinoid on Wiktionary, CC BY-SA 4.0.