motor unit


: a motor neuron together with the muscle fibers on which it acts

Example Sentences

Recent Examples on the Web The shortage has affected the special operations unit, which investigates violent crimes; the motor unit, which provides traffic enforcement; the neighborhood policing division, which coordinates homeless outreach efforts, and others. San Diego Union-Tribune, 3 July 2022 The Fazua’s seven-pound battery-motor unit is slim, and so sleek in its integration that most passersby assume it’s a regular bike, not an e-bike. Kelly Bastone, Outside Online, 24 July 2021 Brown, 70, was the first woman to ride a Harley-Davidson in the motor unit. Washington Post, 26 July 2021 During his decades-long career as a police officer, Haas has served on the department's honor guard, motor unit and the police union's executive board. Quinlan Bentley, The Enquirer, 29 Apr. 2021 Between the rear wheels is a twin-motor unit that acts as a differential to give power to the rear wheels. Robert Duffer,, 12 June 2017 Both front and rear motors recapture energy when coasting to power the batteries, and the rear motor unit is automatically decoupled in certain situations, such as highway cruising, to improve efficiency. Robert Duffer,, 12 June 2017 Previously, researchers have been able to detect up to 25 individual motor units. R. Douglas Fields, Scientific American, 27 Mar. 2018 See More

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

Word History

First Known Use

1925, in the meaning defined above

Time Traveler
The first known use of motor unit was in 1925

Dictionary Entries Near motor unit

Cite this Entry

“Motor unit.” Dictionary, Merriam-Webster, Accessed 2 Dec. 2022.

Medical Definition

motor unit


: a motor neuron together with the muscle fibers on which it acts
Love words? Need even more definitions?

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

The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.