Krakatoa Syllabification: (Kra·ka·toa)Pronunciation: /ˌkrakəˈtōə, ˌkräk-/Definition of Krakatoa a small volcanic island in Indonesia that lies between Java and Sumatra. It was the scene of a great eruption in 1883 that destroyed most of the island. Krakatoa in other Oxford dictionaries Definition of Krakatoa in the British & World English dictionary