This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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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.

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.

n. The number of ten thousand.

n. An indefinitely great number.

Numberless; innumerable; multitudinous; manifold.

n. a large indefinite number

n. the cardinal number that is the product of ten and one thousand

adj. too numerous to be counted

"The machine, code-named Blue Waters and set for delivery to the University of Illinois later this year, is the product of work completed in myriad IBM offices around the world."

incalculable   

large indefinite quantity    large indefinite amount    large integer   

plethora   

countless   

period   

countless    various    multiple    diverse    lesser    numberless    multitudinous    invisible    golden    imaginary