my·​o·​sin | \ ˈmī-ə-sən How to pronounce myosin (audio) \

Definition of myosin

: a fibrous globulin of muscle that can split ATP and that reacts with actin in muscle contraction to form actomyosin

Examples of myosin in a Sentence

Recent Examples on the Web Actin and myosin, the proteins of muscles, permit those bodies to move around. The Economist, 30 Nov. 2020 Matsuno agrees that myosins are likely causing cell handedness. Tim Vernimmen, Quanta Magazine, 31 Jan. 2017 Nearly all multicellular animals, except for simple ones like sponges, depend on muscles to move, and all their muscles use some form of contracting fibers in which filaments of the proteins actin and myosin pull past one another to generate force. Quanta Magazine, 13 June 2018 Hundreds or thousands of amino acids are linked together to form proteins such as insulin, collagen, dystrophin, myosin, and the thousands of others needed for life. Sharon Begley, STAT, 1 May 2018 That means making sure the cells have myosin and actin — two proteins that are key to forming the cellular cytoskeleton, and to building muscle filaments. Noah Shachtman, WIRED, 25 Mar. 2009

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'myosin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of myosin

1942, in the meaning defined above

History and Etymology for myosin

International Scientific Vocabulary my- + -ose entry 2 + -in entry 1

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Cite this Entry

“Myosin.” Dictionary, Merriam-Webster, Accessed 5 Dec. 2021.

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More Definitions for myosin


my·​o·​sin | \ ˈmī-ə-sən How to pronounce myosin (audio) \

Medical Definition of myosin

2 : a fibrous globulin of muscle that can split ATP and that reacts with actin to form actomyosin

More from Merriam-Webster on myosin

Nglish: Translation of myosin for Spanish Speakers

Britannica English: Translation of myosin for Arabic Speakers Encyclopedia article about myosin


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