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

Derived forms: virulencies

See also: virulent

Type of: harmfulness, hostility, ill will, injuriousness

Encyclopedia: Virulency