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[ak-tuh-mahy-uh-sin] /ˌæk təˈmaɪ ə sɪn/
noun, Biochemistry.
a complex protein, consisting of myosin and actin, that is the major constituent of skeletal muscle and is thought to interact with ATP to cause muscle contraction.
Origin of actomyosin
First recorded in 1940-45; act(in) + -o- + myosin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for actomyosin


a complex protein in skeletal muscle that is formed by actin and myosin and which, when stimulated, shortens to cause muscle contraction
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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actomyosin in Medicine

actomyosin ac·to·my·o·sin (āk'tə-mī'ə-sĭn)
A protein complex that is the essential contractile substance of muscle, composed of the globulin myosin and actin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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