ja·ra·ra·cus·su noun orja·ra·ra·cu·cu\ˌzharəˌräkəˈsü\ (-s) Etymology: Portuguese jararacuçu, jararacuçú, from Tupi jararaca wassu & Guarani yararaca wassu, literally, big jararaca : a venomous pit viper (Bothrops jararacussu) of Brazil that is related to the fer-de-lance