ˈmīəsə̇n noun
( -s )
Etymology: International Scientific Vocabulary myos- (from Greek myos, gen. of mys mouse, muscle) + -in — more at mouse
: either of two proteins that are extracted from muscle by salt solutions and that are thought to constitute the chief components of the contractile mechanism:
a. : actomyosin
b. : a fibrous globulin that interreacts with actin and adenosine triphosphate with resulting enzymatic hydrolysis of the triphosphate to adenosine diphosphate and inorganic phosphate