Z line

noun

: any of the dark thin bands across a striated muscle fiber that mark the junction of actin filaments in adjacent sarcomeres

Examples of Z line in a Sentence

Recent Examples on the Web Trains on the 2, 3, A, C, J and Z lines were running at lower speeds in the area. —Joe Ruiz Jr., CBS News, 18 Apr. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'Z line.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1916, in the meaning defined above

Time Traveler
The first known use of Z line was in 1916

Dictionary Entries Near Z line

Zlatoust

Z line

zloty

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Cite this Entry

“Z line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Z%20line. Accessed 1 Oct. 2023.

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Medical Definition

Z line

noun
: any of the dark bands across a striated muscle fiber that mark the junction of actin filaments in adjacent sarcomeres

More from Merriam-Webster on Z line

Britannica.com: Encyclopedia article about Z line

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