actomyosin

[ak-tuh-mahy-uh-sin]

ac·to·my·o·sin

[ak-tuh-mahy-uh-sin]
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:
1940–45; act(in) + -o- + myosin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Actomyosin is always a great word to know.
So is neodymium. Does it mean:
Symbol: No; atomic weight: 259; atomic number: 102
Symbol: Nd; atomic weight: 144.24; atomic number: 60
Collins
World English Dictionary
actomyosin (ˌæktəʊˈmaɪəsɪn)
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

actomyosin ac·to·my·o·sin (āk'tə-mī'ə-sĭn)
n.
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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