actomyosin

n.
The system of actin and myosin that, with other substances, constitutes muscle fiber and is responsible for muscular contraction.

[ACT(IN) + MYOSIN.]

A protein formed by the coupling of actin and myosin during muscle actions. See also sliding-filament theory.

(ăk'tə-mī'ə-sĭn)
n.

A protein complex that is the essential contractile substance of muscle, composed of the globulin myosin and actin.

The complex of actin and myosin constituting muscle fibers and responsible for the contraction and relaxation of muscle.

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The noun has one meaning:

Meaning #1: a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions

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