americium

A1M3E1R1I1C3I1U1M3
/ˌæməˈɹɪsiəm/

noun

The chemical element (symbol Am) with an atomic number of 95.

Similar
Amatomic number 95
OriginEnglish America ← New Latin America ← Italian Amerigo →
UncommonScrabble 15
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Meanings

nounamericium (usually uncountable, plural americiums)

plural americiums

  1. uncountableusuallychemistryThe chemical element (symbol Am) with an atomic number of 95.
    1. countableusuallychemistryAn atom of this element.

Synonyms & antonyms

nouna radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms

Similar
Amatomic number 95
Broader
metallic elementmetal
Also see
am

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Proto-Indo-European*h₃emh₃-
  2. Proto-Germanic*amalą
  3. Proto-Indo-European*h₃reǵ-
  4. Proto-Indo-European*h₃rḗǵs
  5. Proto-Celtic*rīxs
  6. Proto-Germanic*rīks
  7. Proto-Germanic*Amalarīks
  8. Proto-Indo-European*ḱey-
  9. Proto-Indo-European*ḱóymos
  10. Proto-Indo-European*teḱ-
  11. Proto-Indo-European*tḱéytibf.
  12. Proto-Indo-European*tḱey-
  13. Proto-Indo-European*tḱóymos
  14. Proto-Germanic*haimaz
  15. Proto-Germanic*rīks
  16. Proto-Germanic*Haimarīksder.?
  17. ItalianAmerigo
  18. New LatinAmerica
  19. EnglishAmerica
  20. Englishamericium

From Americ(as) + -ium, by analogy with europium.

Full word history & related roots →

Translations

Afrikaans amerisium, amerikium
  • amerisiumchemical element with atomic number 95
  • amerikiumchemical element with atomic number 95
Arabic أَمِرِيكِيُوم
  • أَمِرِيكِيُوم (ʔamirīkiyūm)chemical element with atomic number 95
Basque amerizioa
  • amerizioachemical element with atomic number 95
Bulgarian америций
  • америций (americij)chemical element with atomic number 95
Catalan americi
  • americichemical element with atomic number 95
Chinese Mandarin 鎇 /镅, 鋂 /𰾄
  • 鎇 /镅 (méi)chemical element with atomic number 95
  • 鋂 /𰾄 (méi)chemical element with atomic number 95
Czech americium
  • americiumchemical element with atomic number 95
Danish americium
  • americiumchemical element with atomic number 95
Dutch americium
  • americiumchemical element with atomic number 95
Esperanto americio
  • americiochemical element with atomic number 95
Estonian ameriitsium
  • ameriitsiumchemical element with atomic number 95
Finnish amerikium
  • amerikiumchemical element with atomic number 95
French américium
  • américiumchemical element with atomic number 95
German Americium
  • Americiumchemical element with atomic number 95
Greek αμερίκιο
  • αμερίκιο (ameríkio)chemical element with atomic number 95
Hebrew אמריציום
  • אמריציום (amerítsiyum)chemical element with atomic number 95
Hungarian amerícium
  • ameríciumchemical element with atomic number 95
Icelandic ameríkín
  • ameríkínchemical element with atomic number 95
Irish aimeiriciam
  • aimeiriciamchemical element with atomic number 95
Italian americio
  • americiochemical element with atomic number 95
Japanese アメリシウム
  • アメリシウム (amerishiumu)chemical element with atomic number 95
Korean 아메리슘
  • 아메리슘 (amerisyum)chemical element with atomic number 95
Latin americium
  • americiumchemical element with atomic number 95
Latvian amerīcijs
  • amerīcijschemical element with atomic number 95
Lithuanian americis
  • americischemical element with atomic number 95
Malay amerisium
  • amerisiumchemical element with atomic number 95
Norwegian americium
  • americiumchemical element with atomic number 95
Persian آمریکیوم
  • آمریکیوم (âmerikiyom)chemical element with atomic number 95
Polish ameryk
  • amerykchemical element with atomic number 95
Portuguese amerício
  • ameríciochemical element with atomic number 95
Romanian americiu
  • americiuchemical element with atomic number 95
Russian амери́ций
  • амери́ций (amerícij)chemical element with atomic number 95
Scottish Gaelic aimeiriciam
  • aimeiriciamchemical element with atomic number 95
Slovak americium
  • americiumchemical element with atomic number 95
Spanish americio
  • americiochemical element with atomic number 95
Swedish americium
  • americiumchemical element with atomic number 95
Tamil அமெரிகியம், அமெரிசியம்
  • அமெரிகியம் (amerikiyam)chemical element with atomic number 95
  • அமெரிசியம் (americiyam)chemical element with atomic number 95
Thai อะเมริเซียม
  • อะเมริเซียม (à-mee-rí-sîiam)chemical element with atomic number 95
Turkish amerikyum
  • amerikyumchemical element with atomic number 95
Ukrainian америцій
  • америцій (amerycij)chemical element with atomic number 95
Vietnamese Amerixi, Ameriđi
  • Amerixichemical element with atomic number 95
  • Ameriđichemical element with atomic number 95
Welsh americiwm
  • americiwmchemical element with atomic number 95
Cite this entry
APA

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

MLA

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

Chicago

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

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