myofibril

noun
myo·​fi·​bril | \ ˌmī-ə-ˈfī-brəl How to pronounce myofibril (audio) , -ˈfi- How to pronounce myofibril (audio) \

Definition of myofibril

: any of the longitudinal parallel contractile elements of a muscle cell that are composed of myosin and actin

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Other Words from myofibril

myofibrillar \ ˌmī-​ə-​ˈfī-​brə-​lər How to pronounce myofibril (audio) \ adjective

Examples of myofibril in a Sentence

Recent Examples on the Web Our bodies rebuild these tears by adding either sarcomeres, which are fibrous proteins inside muscle cells, or myofibrils—chains of rod-like units also in muscle cells that give them their striped appearance. Popular Science, "Everything you’ve ever wanted to know about muscles," 1 Jan. 2019 More myofibrils will increase the mass of a muscle cell while more sarcomeres will increase the length. Popular Science, "Everything you’ve ever wanted to know about muscles," 1 Jan. 2019

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

First Known Use of myofibril

1898, in the meaning defined above

History and Etymology for myofibril

New Latin myofibrilla, from my- + fibrilla fibril

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Time Traveler for myofibril

Time Traveler

The first known use of myofibril was in 1898

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Cite this Entry

“Myofibril.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/myofibril. Accessed 6 May. 2021.

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More Definitions for myofibril

myofibril

noun
myo·​fi·​bril | \ ˌmī-ō-ˈfīb-rəl, -ˈfib- How to pronounce myofibril (audio) \

Medical Definition of myofibril

: one of the longitudinal parallel contractile elements of a muscle cell that are composed of myosin and actin

Other Words from myofibril

myofibrillar \ -​rə-​lər How to pronounce myofibril (audio) \ adjective

More from Merriam-Webster on myofibril

Britannica.com: Encyclopedia article about myofibril

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