myosin

[mahy-uh-sin]
noun Biochemistry.
the principal contractile protein of muscle.

Origin:
1865–70; my- + -ose2 + -in2

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World English Dictionary
myosin (ˈmaɪəsɪn)
 
n
the chief protein of muscle that interacts with actin to form actomyosin during muscle contraction; it is also present in many other cell types
 
[C19: from myo- + -ose² + -in]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

myosin my·o·sin (mī'ə-sĭn)
n.
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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American Heritage
Science Dictionary
myosin   (mī'ə-sĭn)  Pronunciation Key 
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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Example sentences
One that churns out actin and myosin, which link up to form units that can expand and contract, will become a muscle cell.
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