neptunium

N1E1P3T1U1N1I1U1M3
/nɛpˈtjuːniəm//nɛpˈtuːniəm/

noun

The transuranic chemical element with atomic number 93 and symbol Np.

Similar
Npatomic number 93
OriginEnglish Neptune ← Middle English Neptune ← Old English Neptune →
UncommonScrabble 13
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Meanings

nounneptunium (uncountable)
  1. uncountablechemistryThe transuranic chemical element with atomic number 93 and symbol Np.
    1. countablechemistryAn atom of this element.

Synonyms & antonyms

nouna radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium

Similar
Npatomic number 93
Broader
metallic elementmetal
Also see
np

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Proto-Indo-European*nebʰ-
  2. Proto-Indo-European*népōts
  3. Etruscan𐌍𐌄𐌐𐌄𐌕𐌄 (nepete)
  4. Proto-Italic*neptūnos
  5. LatinNeptūnus
  6. Old EnglishNeptune
  7. Middle EnglishNeptune
  8. EnglishNeptune
  9. Englishneptunium

After Neptune (the planet), + -ium. The previous element is uranium, named after the previous planet: Uranus.

Full word history & related roots →

Translations

Afrikaans neptunium
  • neptuniumchemical element
Arabic نِبْتُونِيُوم
  • نِبْتُونِيُوم (nibtūniyūm)chemical element
Basque neptunioa
  • neptunioachemical element
Bulgarian непту́ний
  • непту́ний (neptúnij)chemical element
Catalan neptuni
  • neptunichemical element
Chinese Mandarin 镎
  • 镎 (ná)chemical element
Czech neptunium
  • neptuniumchemical element
Danish neptunium
  • neptuniumchemical element
Dutch neptunium
  • neptuniumchemical element
Esperanto neptunio
  • neptuniochemical element
Estonian neptuunium
  • neptuuniumchemical element
Finnish neptunium
  • neptuniumchemical element
French neptunium
  • neptuniumchemical element
German Neptunium
  • Neptuniumchemical element
Greek ποσειδώνιο
  • ποσειδώνιο (poseidónio)chemical element
Hebrew נפטוניום
  • נפטוניום (neptúnyum)chemical element
Hungarian neptúnium
  • neptúniumchemical element
Icelandic neptún, neptúnín
  • neptúnchemical element
  • neptúnínchemical element
Irish neiptiúiniam
  • neiptiúiniamchemical element
Italian nettunio
  • nettuniochemical element
Japanese ネプツニウム
  • ネプツニウム (neputsuniumu)chemical element
Korean 넵투늄
  • 넵투늄 (neptunyum)chemical element
Latin neptunium
  • neptuniumchemical element
Latvian neptūnijs
  • neptūnijschemical element
Lithuanian neptūnas
  • neptūnaschemical element
Malay neptunium
  • neptuniumchemical element
Norwegian Bokmål neptunium
  • neptuniumchemical element
Polish neptun
  • neptunchemical element
Portuguese neptúnio
  • neptúniochemical element
Romanian neptuniu
  • neptuniuchemical element
Russian непту́ний
  • непту́ний (neptúnij)chemical element
Scottish Gaelic neiptiùiniam
  • neiptiùiniamchemical element
Slovak neptunium
  • neptuniumchemical element
Spanish neptunio
  • neptuniochemical element
Swedish neptunium
  • neptuniumchemical element
Tamil நெருப்பியம்
  • நெருப்பியம் (neruppiyam)chemical element
Thai เนปทูเนียม
  • เนปทูเนียม (néep-tuu-nîiam)chemical element
Turkish neptünyum
  • neptünyumchemical element
Ukrainian непту́ній
  • непту́ній (neptúnij)chemical element
Vietnamese neptuni
  • neptunichemical element
Welsh neptwniwm
  • neptwniwmchemical element
Yiddish נעפּטוניום
  • נעפּטוניום (neptunyum)chemical element
Cite this entry
APA

neptunium. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/neptunium

MLA

“neptunium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/neptunium. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “neptunium,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/neptunium.

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