Argos Syllabification: (Ar·gos)Pronunciation: /ˈärgəs, -gôs/Definition of Argos a city in southern Greece, in the northeastern Peloponnese; population 23,600 (est. 2009). One of the oldest cities of ancient Greece, it dominated the Peloponnese and the western Aegean in the 7th century bc. Argos in other Oxford dictionaries Definition of Argos in the British & World English dictionary