positronium
/ˌpɒzɪˈtɹɒniəm/noun
positronium is spelled P-O-S-I-T-R-O-N-I-U-M: 11 letters. It appears about once in every 45 million words in written English, the 206,808th most frequent word form (wordfreq, 2021 data). As a noun, positronium means “An exotic atom (specifically, an onium) consisting of a positron (antielectron) and an electron, as a particle–anti-particle bound pair with no…” (English Wiktionary, September 2026). The plural of positronium is positroniums or positronia.
How many letters and syllables are in positronium?
| Letters | 11: P-O-S-I-T-R-O-N-I-U-M |
|---|---|
| In writing | about once in every 45 million words; the 206,808th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is positronium?
Positronium appears about once in every 45 million words in written English, the 206,808th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce positronium?
- US /ˌpɒzɪˈtɹɒniəm/
- US /ˌpɒzɪˈtɹoʊniəm/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Aadenboy-positronium.wav, Wikimedia Commons (author and licence on each file's page).
Forms of positronium
- positroniums plural
- positronia plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does positronium mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
An exotic atom (specifically, an onium) consisting of a positron (antielectron) and an electron, as a particle–anti-particle bound pair with no nucleus.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Positronium in Spanish, French, German and Portuguese
In the sense exotic atom:
| Language | Words |
|---|---|
| German | Positronium |
| Spanish | positronio |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does positronium come from?
From positr(on) + -onium.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).