piassava Syllabification: (pi·as·sa·va)Pronunciation: /ˌpēəˈsävə/ (also piassaba /-bə/)Definition of piassava noun a stout fiber obtained from the leaf stalks of a number of South American and African palm trees. a palm tree producing piassava. Origin: mid 19th century: via Portuguese from Tupi piaçábapiassava in other Oxford dictionaries Definition of piassava in the British & World English dictionary