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Noun: virulence  viryuluns
  1. Extreme harmfulness (as the capacity of a microorganism to cause disease)
    "the virulence of the plague"
    - virulency
     
  2. Extreme hostility
    "the virulence of the malicious old man"
    - virulency

Derived forms: virulences

See also: virulent

Type of: harmfulness, hostility, ill will, injuriousness

Encyclopedia: Virulence