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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

The studies focus on a group of experimental pain-relieving compounds that act on mu opioid receptors.

From Science Daily ● Jan. 6, 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

How many different ways could you combine mu shu pancakes and fillings?

From "Little Fires Everywhere" by Celeste Ng

Mu Xinyue called it "the happiest moment of my life" after she became the first woman to win an Asian Games gold medal in eSports.

From Barron's ● Oct. 1, 2026

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

From Science Daily ● Aug. 27, 2026

But, after taking silver at three consecutive global championships amid captivating battles with American Athing Mu and Kenya’s Mary Moraa, Hodgkinson finally took the top step of a podium at the Paris Olympics.

From BBC ● Aug. 15, 2026

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

From Salon ● Sep. 17, 2024

After I grew up, I heard the chant of Fa Mu Lan, the girl who took her father’s place in battle.

From "The Woman Warrior" by Maxine Hong Kingston

Micron MU 0.00%increase; up pointing triangle Technology said profit and revenue surged in the fiscal fourth quarter, as its memory chips remained a hot commodity amid the build-out of artificial-intelligence infrastructure.

From The Wall Street Journal ● Sep. 30, 2026

Those arguments have been countered by Micron MU -6.99%decrease; down pointing triangle , the only sizable U.S. maker of memory chips.

From The Wall Street Journal ● Jul. 25, 2026

On Wednesday, Micron Technology MU -0.31%decrease; down pointing triangle answered.

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

AM MU NI' TION, military stores, as powder, balls, &c.

From Sanders' Union Fourth Reader by Charles W. Sanders