a protein in muscles
Origin of actin; from Classical Latin actus (see act) + -in
actino-: used before a vowel: actinal
A protein found in muscle that together with myosin functions in muscle contraction.
Origin of actinLatin actus, motion; see act + –in.
Variant of actino–.
(countable and uncountable, plural actins)
From Ancient Greek ἀκτίς (aktis, “ray”), based on the shape of the filament formed, and the English chemical suffix -in.