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[mahy-uh-sin] /ˈmaɪ ə sɪn/
noun, Biochemistry
the principal contractile protein of muscle.
Origin of myosin
1865-70; my- + -ose2 + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for myosin
Historical Examples
  • The pemmican we used consisted of powdered dried beef (containing the important protein, myosin) and 50 per cent.

    The Home of the Blizzard Douglas Mawson
  • Other forms of protein are globulin and myosin, which form the actual muscle-substance.

    Encyclopedia of Diet Eugene Christian
  • Another similar experiment made with antipeptone, formed from the myosin of muscle-tissue, gave like results.

    On Digestive Proteolysis R. H. Chittenden
  • Into this special class fall myosin (of the muscles), fibrinogen (of the blood) and vitellin (of egg yolk).

    Animal Proteins Hugh Garner Bennett
British Dictionary definitions for myosin


the chief protein of muscle that interacts with actin to form actomyosin during muscle contraction; it is also present in many other cell types
Word Origin
C19: from myo- + -ose² + -in
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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myosin in Medicine

myosin my·o·sin (mī'ə-sĭn)
The commonest protein in muscle cells, a globulin responsible for the elastic and contractile properties of muscle and combining with actin to form actomyosin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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myosin in Science
A protein found in muscle tissue as a thick filament made up of an aggregate of similar proteins. Myosin and the protein actin form the contractile units (sarcomeres) of skeletal muscle. In the sarcomere, actin and myosin filaments slide past each other to cause the shortening of a muscle fiber.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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