noun · 3 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
plo͞otō'nēəm
/pluːˈtoʊniəm/
General-American:Recorded audio is listed in the source snapshot.
US:Recorded audio is listed in the source snapshot.
rhymes with -əʊniəm
CMU ARPABET:P L UW0 T OW1 N IY0 AH0 M
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
The transuranic chemical element with atomic number 94 and symbol Pu: a silvery-gray fissile radioactive actinide metal that tarnishes when exposed to air.
Definition source: English Wiktionary via Wiktextract
Usage: uncountable, usually
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
Alternative form of ploutonion.
Definition source: English Wiktionary via Wiktextract
Usage: alt-of, alternative, countable, historical, usually
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: Pu, atomic number 94
Antonyms: none provided
Broader terms: chemical element, element
Narrower terms: plutonium 239
History
Etymology
After Pluto (dwarf planet) + -n- + -ium. More in Wikipedia at plutonium § History.
Across languages
Translations
85 source translations are retained for this English entry.
Afrikaans:
plutonium
— chemical element
Albanian:
plutonium
— chemical element
Amharic:
ፕሉቶኒየም
(pəlutoniyäm)
— chemical element
Arabic:
بُلُوتُونِيُوم
(bulūtūniyūm)
— chemical element
Armenian:
պլուտոնիում
(plutonium)
— chemical element
Asturian:
plutoniu
— chemical element
Azerbaijani:
plutonium
— chemical element
Basque:
plutonioa
— chemical element
Belarusian:
плуто́ній
(plutónij)
— chemical element
Bengali:
প্লুটোনিয়াম
(pluṭōniẏam)
— chemical element
Breton:
plutoniom
— chemical element
Bulgarian:
плуто́ний
(plutónij)
— chemical element
Burmese:
ပလူတိုနီယမ်
(pa.lutuiniyam)
— chemical element
Catalan:
plutoni
— chemical element
Chinese Cantonese:
鈈 /钚
(bou1)
— chemical element
Chinese Mandarin:
鈈 /钚
(bù)
— chemical element
Chinese Mandarin:
鈽 /钸
(bù)
— chemical element
Cornish:
plutoniom
— chemical element
Czech:
plutonium
— chemical element
Danish:
plutonium
— chemical element
Dutch:
plutonium
— chemical element
Esperanto:
plutonio
— chemical element
Estonian:
plutoonium
— chemical element
Faroese:
plutonium
— chemical element
Finnish:
plutonium
— chemical element
French:
plutonium
— chemical element
West-Frisian:
plutonium
— chemical element
Galician:
plutonio
— chemical element
Georgian:
პლუტონიუმი
(ṗluṭoniumi)
— chemical element
German:
Plutonium
— chemical element
Greek:
πλουτώνιο
(ploutónio)
— chemical element
Hebrew:
פְּלוּטוֹנְיוּם
(plutónyum)
— chemical element
Hindi:
प्लूटोनियम
(plūṭoniyam)
— chemical element
Hungarian:
plutónium
— chemical element
Icelandic:
plúton
— chemical element
Irish:
plútóiniam
— chemical element
Italian:
plutonio
— chemical element
Japanese:
プルトニウム
(purutoniumu)
— chemical element
Kannada:
ಪ್ಲೂತೋನಿಯಮ್
(plūtōniyam)
— chemical element
Kashubian:
plutón
— chemical element
Kazakh:
плутоний
(plutonii)
— chemical element
Korean:
플루토늄
(peullutonyum)
— chemical element
Kyrgyz:
плутоний
(plutoniy)
— chemical element
Lao:
ພລູໂທເນັຍມ
(phlū thō niam)
— chemical element
Latin:
plūtōnium
— chemical element
Latvian:
plutonijs
— chemical element
Lithuanian:
plutonis
— chemical element
Luxembourgish:
Plutonium
— chemical element
Macedonian:
плутониум
(plutonium)
— chemical element
Malay:
plutonium
— chemical element
Maltese:
plutonju
— chemical element
Manx:
plutonium
— chemical element
Mongolian:
плутони
(plutoni)
— chemical element
Norwegian Bokmål:
plutonium
— chemical element
Norwegian Nynorsk:
plutonium
— chemical element
Persian:
پلوتونیوم
(plutoniom)
— chemical element
Polish:
pluton
— chemical element
Portuguese:
plutónio
— chemical element
Romanian:
plutoniu
— chemical element
Russian:
плуто́ний
(plutónij)
— chemical element
Scottish Gaelic:
plutòiniam
— chemical element
Serbo-Croatian:
плу̀то̄нӣј
— chemical element
Serbo-Croatian:
plùtōnīj
— chemical element
Slovak:
plutonium
— chemical element
Slovene:
plutonij
— chemical element
Spanish:
plutonio
— chemical element
Swahili:
plutoni
— chemical element
Swedish:
plutonium
— chemical element
Tagalog:
plutonyo
— chemical element
Tajik:
плутоний
(plutoniy)
— chemical element
Tamil:
புலூட்டோனியம்
(pulūṭṭōṉiyam)
— chemical element
Tatar:
плутоний
(plutoniy)
— chemical element
Telugu:
ప్లూటోనియమ్
(plūṭōniyam)
— chemical element
Thai:
พลูโทเนียม
(pluu-too-nîiam)
— chemical element
Tibetan:
ཕུ་ལུ་ཊོ་ནིམ
(phu lu ṭo nim)
— chemical element
Turkish:
plütonyum
— chemical element
Turkmen:
plutoniý
— chemical element
Ukrainian:
плуто́ній
(plutónij)
— chemical element
Urdu:
پلوٹونیئم
(plūṭoniyam)
— chemical element
Uyghur:
پلوتونىي
(plotoniy)
— chemical element
Uzbek:
plutoniy
— chemical element
Vietnamese:
plutoni
— chemical element
Volapük:
plutonin
— chemical element
Welsh:
plwtoniwm
— chemical element
Yiddish:
פּלוטאָניום
(plutonyum)
— chemical element
