PalauPronunciation: /pəˈlaʊ/ (also Belau)Definition of Palau a group of islands in the western Pacific Ocean, an independent republic since 1990; population 20,800 (est. 2009); capital, Melekeok. It was part of the Pacific Islands Trust Territory administered by the US 1947–80. Palau in other Oxford dictionaries Definition of Palau in the US English dictionary