WordNet (r) 3.0 (2006):

bitter cassava
    n 1: cassava with long tuberous edible roots and soft brittle
         stems; used especially to make cassiri (an intoxicating
         drink) and tapioca [syn: bitter cassava, manioc,
         mandioc, mandioca, tapioca plant, gari, Manihot
         esculenta, Manihot utilissima]