Webster's English Dictionary

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monkey

1. mon.key \'m*n-ke-\ n [prob. of LG origin; akin to Moneke, name of an 
   ape, prob. of Romance ori]gin; akin to OSp mona monkey 1: a primate mammal 
   other than man and usu. also the lemurs and tarsiers; (Xesp : any of the 
   smaller longer-tailed primates as contrasted with the apes 2a: a person 
   resembling a monkey  2b: a ludicrous figure : DUPE  3: any of various 
   machines, implements, or vessels; esp : the falli ng weight of a pile 
   driver
2. monkey vi 1: to act in a grotesque or mischievous manner  2a: FOOL, 
   TRIFLE  2b: TAMPER  : to treat as a monkey does : MIMIC