from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Constituting a very large, indefinite number; innumerable: the myriad fish in the ocean.
  • adj. Composed of numerous diverse elements or facets: the myriad life of the metropolis.
  • n. A vast number: the myriads of bees in the hive.
  • n. Archaic Ten thousand.

from the GNU version of the Collaborative International Dictionary of English

  • n. The number of ten thousand; ten thousand persons or things.
  • n. An immense number; a very great many; an indefinitely large number.
  • adj. Consisting of a very great, but indefinite, number.

from The Century Dictionary and Cyclopedia

  • n. The number of ten thousand.
  • n. An indefinitely great number.
  • Numberless; innumerable; multitudinous; manifold.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a large indefinite number
  • n. the cardinal number that is the product of ten and one thousand
  • adj. too numerous to be counted


Greek mūrias, mūriad-, ten thousand, from mūrios, countless.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French myriade, from Late Latin myrias (genitive of myriadis), from Ancient Greek μυριάδος (myriados), genitive of μυριάς (myrias, "number of 10,000"), from μύριος (myrios, "numberless, countless, infinite"). (Wiktionary)



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  • Greek number for 10,000 - Wolfram Alpha.

    March 28, 2013

  • "The noun myriad has appeared in the works of such writers as Milton (plural myriads) and Thoreau (a myriad of)..."

    December 9, 2012

  • I use myriad almost exclusively as a noun, and can't help but feel I'm in the minority on this. Hearing it as an adjective has always felt strange to me..

    June 26, 2012

  • These properties enable us to process amorphous carbons into a myriad of industrial
    products including chemical-reducing agents, carbide-forming reagents,
    metallurgical products, cathodic protection.

    March 19, 2011

  • I can't see this word and not think of "Heathers."

    September 26, 2008

  • I can't see this word and not think of the default Adobe font.

    December 19, 2006


    Read the usage note. Myriad was originally a noun.

    December 2, 2006

  • Dictionaries are linguistically descriptive. Many wordies are prescriptivist.

    December 2, 2006

  • "myriad" is not a noun and should not be used as: "A myriad of folks who misuse this word." The proper use is: "Myriad folks misuse this word."

    December 2, 2006