Z line

noun

Definition of Z line

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

First Known Use of Z line

1916, in the meaning defined above

Keep scrolling for more

Learn More about Z line

Time Traveler for Z line

Time Traveler

The first known use of Z line was in 1916

See more words from the same year

Statistics for Z line

Cite this Entry

“Z line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Z%20line. Accessed 22 Jan. 2021.

Keep scrolling for more

More Definitions for Z line

Z line

noun

Medical Definition of Z line

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

Comments on Z line

What made you want to look up Z line? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Slippery Words Quiz—Changing with the Times

  • ducreux self portrait yawning
  • What is an earlier meaning of nice?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!