μυρίων (myrion)
μυρίων is an Ancient Greek form of μυρίος, meaning “countless; ten thousand”. It is the genitive plural masculine adjective.
Found 310 times in the Ancient Greek texts on Socratos.
Where it is used
Thucydides, History of the Peloponnesian War 2.13.6: χρήμασι μὲν οὖν οὕτως ἐθάρσυνεν αὐτούς, ὁπλίτας δὲ τρισχιλίους καὶ μυρίους εἶναι ἄνευ τῶν ἐν τοῖς φρουρίοις καὶ τῶν παρ’ ἔπαλξιν ἑξακισχιλίων καὶ μυρίων.
All forms of μυρίος (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Liddell-Scott-Jones, A Greek-English Lexicon (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.