Webster's English Dictionary

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cacao

ca.cao \k*-'kau., k*-'ka--(.)o-\ n [Sp, fr. Nahuatle cacahuatl cacao beans] 
   1: any of several trees (genus Theobroma) of the chocolate family; Xesp : 
   CHOCOLATE TREE 2: the dried partly fermented fatty seeds of the chocolate 
   tree used in mak ing cocoa and chocolate