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plutonium.

The transuranic chemical element with atomic number 94 and symbol Pu: a silvery-gray fissile radioactive actinide metal that tarnishes when exposed to air.

9 characters3 syllables approx.English language

Meaning & usage

noun/pluːˈtoʊniəm/
  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.

    uncountable · usually
  2. The transuranic chemical element with atomic number 94 and symbol Pu: a silvery-gray fissile radioactive actinide metal that tarnishes when exposed to air. An atom of this element.

    countable · usually
  3. Alternative form of ploutonion.

    alt-of · alternative · countable · historical · usually
Where this word comes from

Etymology tree Ancient Greek πλοῦτος (ploûtos) Proto-Indo-European *-Hō Ancient Greek -ων (-ōn) Ancient Greek Πλούτων (Ploútōn)bor. Latin Plūtōbor. Middle English Pluto English Pluto English -n- Proto-Indo-European *-om Proto-Italic *-om Latin -umder. English -ium English plutonium After Pluto (dwarf planet) + -n- + -ium. More in Wikipedia at plutonium § History.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.