Etymology tree Proto-Indo-European *set-? Ancient Greek ἐτεός (eteós)der.? Ancient Greek ἔτῠμος (étŭmos) Ancient Greek ἔτῠμον (étŭmon)bor. English etymon From Ancient Greek ἔτυμον (étumon, “the true sense of a word according to its origin”), from ἔτυμος (étumos, “true, real, actual”).