neptunium.
The transuranic chemical element with atomic number 93 and symbol Np.
Meaning & usage
The transuranic chemical element with atomic number 93 and symbol Np.
The transuranic chemical element with atomic number 93 and symbol Np. An atom of this element.
Where this word comes from
Etymology tree Proto-Indo-European *nebʰ- Proto-Indo-European *-os Proto-Indo-European *nébʰosder. Proto-Italic *neptūnos Latin Neptūnusbor. Middle English Neptune English Neptune Proto-Indo-European *-om Proto-Italic *-om Latin -umder. English -ium English neptunium After Neptune (the planet), + -ium. The previous element is uranium, named after the previous planet: Uranus.
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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.