Etymology tree Ancient Greek μῡρῐ́ος (mūrĭ́os) Ancient Greek -ᾰ́ς (-ắs) Ancient Greek μῡρῐᾰ́ς (mūrĭắs)bor. Late Latin mȳriasbor. French myriade English myriad From French myriade, from Late Latin mȳriadem (accusative of mȳrias), from Ancient Greek μυριάς (muriás, “number of 10,000”), from μυρίος (muríos, “numberless, countless, infinite”). By surface analysis, myria- + -ad.