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• mu
  mu

  noun

  the 12th letter of the Greek alphabet (M, μ).
• Mu
  Mu

  noun

  another name for Lemuria.
• MU
  MU

  abbreviation

  Musicians' Union

mu

¹ American  

[myoo, moo] / mju, mu /

noun

1. the 12th letter of the Greek alphabet (M, μ).

2. the consonant sound represented by this letter.

3. micron.

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Mu ² American  

[myoo, moo] / mju, mu /

noun

1. another name for Lemuria.

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MU ¹ British  

abbreviation

1. Musicians' Union

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mu ² British  

/ mjuː /

noun

1. the 12th letter in the Greek alphabet (Μ, μ), a consonant, transliterated as m

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mu ³ British  

abbreviation

1. Mauritius

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Etymology

Origin of mu

First recorded in 1895–1900, mu is from the Greek word mŷ

Example Sentences

See Examples For:

mu Mu MU

They removed mu opioid receptors specifically from locus coeruleus brain cells in mice with neuropathic pain.

From Science Daily ● Aug. 27, 2026

Without those receptors, the animals became even more sensitive to touch and heat than mice whose locus coeruleus cells still had mu opioid receptors.

From Science Daily ● Aug. 27, 2026

However, naltrexone, in both short- and long-acting forms, has the opposite pharmacology: it antagonizes mu receptors, occupying them without activating them.

From Scientific American ● Sep. 13, 2023

This part is called il mu, which can be translated as “line dance” or “one dance.”

From New York Times ● Jul. 12, 2023

Back in the kitchen, Ugwu was surprised to hear Master’s mother singing a gently melodious church song: Nya nya oya mu ga-ana.

From "Half of a Yellow Sun" by Chimamanda Ngozi Adichie

Mu opioid receptors are found throughout the brain and spinal cord.

From Science Daily ● Aug. 27, 2026

Then each family would have Mu Shu for dinner that night.

From Salon ● Sep. 17, 2024

In the absence of American defending champion Athing Mu in Paris, world champion Mary Moraa represents the main obstacle to success for Hodgkinson, who beat the Kenyan in Eugene this season.

From BBC ● Jul. 20, 2024

Athing Mu, the defending Olympic gold medalist, withdrew from the 800 meters because of lingering hamstring soreness and will instead focus on the trials.

From Seattle Times ● May 25, 2024

She said I would grow up a wife and a slave, but she taught me the song of the warrior woman, Fa Mu Lan.

From "The Woman Warrior" by Maxine Hong Kingston

U.S. stock futures pointed higher in early morning European trade after Micron Technology’s MU -0.31%decrease; down pointing triangle expectation-thumping earnings reignited optimism in the artificial-intelligence boom.

From The Wall Street Journal ● Jun. 25, 2026

Micron MU -0.31%decrease; down pointing triangle Technology reported a more than fourfold increase in revenue in its latest quarter, boosted by continued strong demand for its memory chips.

From The Wall Street Journal ● Jun. 24, 2026

Micron MU, with a $665 billion market capitalization, has seen its stature grow rapidly as memory chips have proved a major bottleneck to the artificial-intelligence buildout.

From MarketWatch ● May 4, 2026

"This breakthrough unlocks one of astronomy's big puzzles," says Dr. Lewis Prole, a postdoctoral fellow at MU and member of the research team.

From Science Daily ● Jan. 26, 2026

Such men as those called KA-DUR, KAPAR, MU, PATESI, are named on the letters as exempt from the service.

From Babylonian and Assyrian Laws, Contracts and Letters by C. H. W. (Claude Hermann Walter) Johns