a protein in muscles
Origin of actin; from Classical Latin actus (see act) + -in
actino-: used before a vowel: actinal
Variant of actino–.
A protein found in muscle that together with myosin functions in muscle contraction.
Origin of actinLatin āctus, motion; see act + –in.
(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.