protactinium
/ˌpɹoʊ.tækˈtɪn.i.əm/noun
protactinium is spelled P-R-O-T-A-C-T-I-N-I-U-M: 12 letters and 5 syllables. It appears about once in every 37 million words in written English, the 187,122nd most frequent word form (wordfreq, 2021 data). As a noun, protactinium means “A chemical element (symbol Pa) with atomic number 91. A dense, silvery-gray actinide metal” (English Wiktionary, September 2026).
How many letters and syllables are in protactinium?
| Letters | 12: P-R-O-T-A-C-T-I-N-I-U-M |
|---|---|
| Syllables | 5 (from its pronunciation) |
| In writing | about once in every 37 million words; the 187,122nd 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 protactinium?
Protactinium appears about once in every 37 million words in written English, the 187,122nd 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 protactinium?
- UK /ˌpɹəʊ.tækˈtɪn.i.əm/
- US /ˌpɹoʊ.tækˈtɪn.i.əm/
Protactinium has 5 syllables (counted from the pronunciation).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vininn126-protactinium.wav, LL-Q1860_(eng)-Naomi_Persephone_Amethyst_(NaomiAmethyst)-protactinium.wav, LL-Q1860_(eng)-Tesco250-protactinium.wav, Wikimedia Commons (author and licence on each file's page).
What rhymes with protactinium?
2 words on PlainSpell end in the same sounds as protactinium from its last stressed vowel (/ɪniəm/):
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 protactinium mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A chemical element (symbol Pa) with atomic number 91. A dense, silvery-gray actinide metal.
- 2
An atom of this element.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Protactinium in Spanish, French, German and Portuguese
In the sense chemical element:
| Language | Words |
|---|---|
| French | protactinium |
| German | Protactinium |
| Portuguese | protactínio |
| Spanish | protactinio |
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 protactinium come from?
From proto- + actinium.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).