neutronium
/nuˈtɹoʊni.əm/noun
neutronium is spelled N-E-U-T-R-O-N-I-U-M: 10 letters. It appears about once in every 52 million words in written English, the 225,584th most frequent word form (wordfreq, 2021 data). As a noun, neutronium means “A material composed entirely of neutrons” (English Wiktionary, September 2026).
How many letters and syllables are in neutronium?
| Letters | 10: N-E-U-T-R-O-N-I-U-M |
|---|---|
| In writing | about once in every 52 million words; the 225,584th most frequent word form |
| Wrong spellings searched | none measured in search |
| Rhymes with |
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); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is neutronium?
Neutronium appears about once in every 52 million words in written English, the 225,584th 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 neutronium?
- UK /njuːˈtɹəʊni.əm/
- US /nuˈtɹoʊni.əm/
- US /nuˈtɹoʊnjəm/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-neutronium.wav, Wikimedia Commons (author and licence on each file's page).
What rhymes with neutronium?
The 12 most written words on PlainSpell end in the same sounds as neutronium from its last stressed vowel (/oʊniəm/):
- ammonium
- pandemonium
- polonium
- harmonium
- pancuronium
- vecuronium
- hydronium
- rocuronium
- pandamonium
- tetraethylammonium
- onium
- suxamethonium
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
What does neutronium mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A material composed entirely of neutrons.
- 2
A hypothetical gravitationally bound system of a neutron and an antineutron (the onium of a neutron), not predicted to exist under normal circumstances.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Neutronium in Spanish, French, German and Portuguese
In the sense neutron star material:
| Language | Words |
|---|---|
| French | neutronium |
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 neutronium come from?
From neutron + -ium. Coined by scientist Andreas von Antropoff in 1926 (before the discovery of the neutron in 1931; neutrons had been predicted to exist in 1920).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).