Webster's English Dictionary

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gorilla

go.ril.la \g*-'ril-*\ n [deriv. of Gk Gorillai, an African tribe of hairy 
   women] 1: an anthropoid ape (Gorilla gorilla) of west equatorial Africa 
   rela ted to the chimpanzee but less erect and much larger 2a: an ugly or 
   brutal man  2b: THUG, GOON