proa Syllabification: (pro·a)Pronunciation: /ˈprōə/ (also prahu /ˈpräˌo͞o/ or prau /prou/)Definition of proa noun a type of sailing boat originating in Malaysia and Indonesia that may be sailed with either end at the front, typically having a large triangular sail and an outrigger. Origin: late 16th century: from Malay perahuproa in other Oxford dictionaries Definition of proa in the British & World English dictionary