noun · 1 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
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General-American:nĭhō'nēəm
General-American:/nɪˈhoʊ.ni.əm/
Southern-England:Recorded audio is listed in the source snapshot.
General-American:Recorded audio is listed in the source snapshot.
1
noun
Meaning 1
The synthetic transactinide chemical element with atomic number 113.
Definition source: English Wiktionary via Wiktextract
Usage: uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
History
Etymology
From Japanese 日本 (Nihon, “Japan”) + -ium. Promulgated in June 2016 by the IUPAC based on recommendations of the RIKEN Nishina Center for Accelerator-Based Science to honor the country where the element was discovered. Doublet of nipponium.
Across languages
Translations
29 source translations are retained for this English entry.
