actinin
noun
actinin is a noun meaning “Any of several microfilament proteins that have a function in the attachment of actin fibres in muscle cells” (English Wiktionary, September 2026). It is spelled A-C-T-I-N-I-N, and it appears about once in every 30 million words in written English (wordfreq, 2021 data). The plural of actinin is actinins.
What does actinin mean?
noun
- 1
Any of several microfilament proteins that have a function in the attachment of actin fibres in muscle cells
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of actinin
- actinins plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is actinin?
Actinin appears about once in every 30 million words in written English, the 167,786th 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).
Actinin in Spanish, French, German and Portuguese
In the sense protein responsible for the attachment of actin fibres in muscle cells:
| Language | Words |
|---|---|
| Portuguese | actinina |
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 actinin come from?
From actin + -in.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).