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myriad (n.)

1550s, "the number of 10,000," also "an indefinitely great number," from French myriade and directly from Late Latin myrias (genitive myriadis) "ten thousand," from Greek myrias (genitive myriados) "a number of ten thousand; countless numbers," from myrios (plural myrioi) "innumerable, countless, infinite; boundless," as a definite number, "ten thousand" ("the greatest number in Greek expressed by one word," Liddell & Scott say), of unknown origin; perhaps from PIE *meue- "abundant" (source also of Hittite muri- "cluster of grapes," Latin muto "penis," Middle Irish moth "penis"). Beekes offers "no etymology." The numerically specific use is usually in translations from Greek or Latin.

myriad (adj.)

"numberless, multitudinous," c. 1800, from myriad (n.).

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Definitions of myriad from WordNet
1
myriad (n.)
a large indefinite number;
he faced a myriad of details
myriad (n.)
the cardinal number that is the product of ten and one thousand;
Synonyms: ten thousand / "
2
myriad (adj.)
too numerous to be counted;
myriad stars
Synonyms: countless / infinite / innumerable / innumerous / multitudinous / numberless / uncounted / unnumberable / unnumbered / unnumerable
From wordnet.princeton.edu