virulency

Noun
  1. Extreme harmfulness (as the capacity of a microorganism to cause disease) (synset 105174087)
    "the virulence of the plague"
    referred to in: micro-organism, microorganism - any organism of microscopic size
    is a type of: harmfulness, injuriousness - destructiveness that causes harm or injury
    same as: virulence
  2. Extreme hostility (synset 104665718)
    "the virulence of the malicious old man"
    is a type of: hostility, ill will - a hostile (very unfriendly) disposition
    same as: virulence

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