actin
/ˈæktɪn/noun
actin is spelled A-C-T-I-N: 5 letters and 2 syllables. It appears 1.4 times per million words in written English, the 24,170th most frequent word form (wordfreq, 2021 data). As a noun, actin means “A globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament)” (English Wiktionary, September 2026). The plural of actin is actins.
How many letters and syllables are in actin?
| Letters | 5: A-C-T-I-N |
|---|---|
| Syllables | 2 (from its American pronunciation) |
| In writing | 1.4 times per million words; the 24,170th most frequent word form |
| Wrong spellings searched | none measured in search |
| Same letters |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; 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 actin?
Actin appears 1.4 times per million words in written English, the 24,170th 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 actin?
- /ˈæktɪn/
Actin has 2 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Wodencafe-actin.wav, Wikimedia Commons (author and licence on each file's page).
What rhymes with actin?
No other word on PlainSpell ends in the same sounds as actin.
Spelled with the same letters in another order: antic.
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).
Forms of actin
- actins plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does actin mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament).
- 2
One of the six isoforms of actin.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Actin in Spanish, French, German and Portuguese
In the sense a globular structural protein:
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 actin come from?
From Ancient Greek ἀκτίς (aktís, “ray”), based on the shape of the filament formed, + -in.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).