Definition of actin in English:


Line breaks: actin
Pronunciation: /ˈaktɪn


[mass noun] Biochemistry
  • A protein which forms (together with myosin) the contractile filaments of muscle cells, and is also involved in motion in other types of cell.
    More example sentences
    • Muscle contraction is dependent on two proteins, actin and myosin.
    • As the cells round up, actin and myosin moieties are being redistributed underneath the plasma membrane.
    • Striated muscle contraction is regulated by a protein complex bound to actin.


1940: from Greek aktis, aktin- 'ray' + -in1.

More definitions of actin

Definition of actin in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
(in science fiction) navigation in outer space