Aegadean Isles n 1: a group of islands off the west coast of Sicily in the Mediterranean [syn: {Egadi Islands}, {Aegadean Isles}, {Aegadean Islands}, {Isole Egadi}, {Aegates}] 2: islands west of Sicily (now known as the Egadi Islands) where the Romans won a naval victory over the Carthaginians that ended the first Punic War in 241 BC [syn: {Aegates Isles}, {Aegadean Isles}]