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a. Characterized by, causing, or promoting the rapid onset of severe illness. Used of a disease or toxin.
b. Capable of causing disease by aggressively interfering with the immune system of the host. Used of a pathogen.
2. Extremely hostile or malicious: virulent criticism; a virulent bigot.
[Middle English, from Latin vīrulentus, from vīrus, poison.]
vir′u·lence, vir′u·len·cy n.
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|Noun||1.||virulency - extreme harmfulness (as the capacity of a microorganism to cause disease); "the virulence of the plague"|
|2.||virulency - extreme hostility; "the virulence of the malicious old man"|