virulency
1. [ noun ] extreme hostility
Synonyms: virulence
Examples:

"the virulence of the malicious old man"

Related terms: hostility
2. [ noun ] extreme harmfulness (as the capacity of a microorganism to cause disease)
Synonyms: virulence
Examples:

"the virulence of the plague"

Related terms: harmfulness microorganism
Similar spelling:   virulence
  virulently
  virulent
  Vierling