actomyosin

noun

ac·​to·​my·​o·​sin ˌak-tə-ˈmī-ə-sən 

: a contractile complex of actin and myosin that together with ATP is active during muscular contraction

Word History

Etymology

act(in) + -o- + myosin

First Known Use

1942, in the meaning defined above

Medical Definition

actomyosin

noun

ac·​to·​my·​o·​sin ˌak-tə-ˈmī-ə-sən 

: a viscous contractile complex of actin and myosin concerned together with ATP in muscular contraction