Definition of mu in English:


Syllabification: mu
Pronunciation: /m(y)o͞o


  • 1The twelfth letter of the Greek alphabet (Μ, μ), transliterated as ‘m.’.
    More example sentences
    • In Braille, the same 1-3-4 dot combination designates the letter "mu" in Greek and "mim" in Arabic (both of which have an "m" sound).
    • Permittivity (denoted by the Greek letter epsilon) is a measure of a material's response to an applied electric field, while permeability (denoted by the letter mu) is a measure of the material's response to an applied magnetic field.
    • I am also looking to see if Word can do the Greek letter mu, or the Greek symbol for sigma.
  • 1.1 (Mu) [followed by Latin genitive] Astronomy The twelfth star in a constellation: Mu Cassiopeiae
    More example sentences
    • Mu Geminorum is a star in the constellation Gemini.
    • For the rest of this week, asteroid Vesta is within 3 degrees lower left of Mu Virginis.
  • 1.2 [as modifier] Physics Relating to muons: mu particle


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  • 1 (μ) Micron.
  • 1.1 (μ) [in combination] “Micro-” in symbols for units: the recommended daily amount is 750μg
  • 1.2 (μ) Permeability.

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