"of Argos," ancient Peloponnesian city portrayed by Homer as the most powerful in Greece, hence, especially in Homeric usage, "the Greeks," as a byword for Achaean, 1520s, from Latin Argivus, from Greek Argeios "of Argos." Related: Argives.
*arg-
argent
Argentina
Argentine
argentine
Argive
argle
Argo
argon
Argonaut
argosy