Webster's English Dictionary

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ferocious

Cross references:
  1. fierce                
 
fe.ro.cious \f*-'ro--sh*s\ aj [L feroc-, ferox, lit., fierce looking, fr. 
   ferus + -oc-X, -ox (akin to Gk o-ps eye) - more at EYE 1: FIERCE, SAVAGE  
   3: unbearably intense : EXTREME {~ heat}  - fe.ro.cious.ly av