Etymology
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ferocious (adj.)

1640s, from Latin ferocis, oblique case of ferox "fierce, wild-looking," from ferus "wild" (from PIE root *ghwer- "wild beast") + -ox (genitive -ocis), a suffix meaning "looking or appearing" (cognate with Greek ōps "eye, sight;" from PIE root *okw- "to see"). Alternative ferocient (1650s) is seldom seen. Related: Ferociously; ferociousness.

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Definitions of ferocious

ferocious (adj.)
marked by extreme and violent energy;
a ferocious beating
Synonyms: fierce / furious / savage
From wordnet.princeton.edu