Entry 2 senses · 2 variants Webster, 1913 Macao /mək-ou'/ · Ma·ca·o · IPA /məkˈaʊ/ n. prop. n. 01 n. A macaw. 1. A macaw.(Zool.) 02 prop. n. A territory in South China, on the Zhu Jiang river on the South China sea, formerly a territory of Portugal. Also, the capital city of thi… 1. A territory in South China, on the Zhu Jiang river on the South China sea, formerly a territory of Portugal. Also, the capital city of this territory.