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Noun: virulency  vir-(y)u-lun(t)-see
  1. (microorganism) 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

Type of: harmfulness, hostility, ill will, injuriousness

Encyclopedia: Virulency