I saw a myriad of stars is correct. Use the article (a). You can use the definate article (the) but only is the listener/reader knows the myriad you are refering to.
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AnonymousMyriad as an adjective, NOT noun: I saw myriad stars.Myriad is both an adjective and a noun:
AnonymousThanks, but I am not talking about the NOUN myriad, only the ADJECTIVE myriad. 'I saw a myriad of stars' is fine because myriad in this instance is a noun. But what if I am using it as an adjective? Do I say: I saw myriad stars (without an article).In that case, no article.