• synonyms


[myoo, moo]
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  1. the 12th letter of the Greek alphabet (M, μ).
  2. the consonant sound represented by this letter.
  3. micron(def 1).
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Origin of mu

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


[myoo, moo]
  1. a legendary lost continent supposed to have sunk into the SW Pacific Ocean at about the same time that Atlantis disappeared into the Atlantic Ocean.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for mu

Contemporary Examples

Historical Examples

  • It is the universal belief that prophets work miracles, (mu'jizt).

  • All the sects except the Shfa'tes hold that the Mu'takif must fast.

  • For, by the 12 e vij, as om is to ma: so is el to la: And as ma is to mu; so is la, to li.

  • And goeth from Epsilon down to Mu: the reference is to some numbering on the parchment.

  • All errors, including the use of mu for nu, are in the original.

    Printers' Marks

    William Roberts

British Dictionary definitions for mu


  1. the 12th letter in the Greek alphabet (Μ, μ), a consonant, transliterated as m
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the internet domain name for
  1. Mauritius
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abbreviation for
  1. Musicians' Union
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

mu in Medicine


(myōō, mōō)
  1. The 12th letter of the Greek alphabet.
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  1. Of, relating to, or being a polypeptide chain that is one of five types of heavy chains present in immunoglobins.
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  1. Mache unit
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.