virulence

viru|lence /v'ɪrjʊləns/
1 [N-UNCOUNT] oft N of n
Virulence is great bitterness and hostility. (FORMAL)
The virulence of the café owner's anger had appalled her.
2 [N-UNCOUNT]
The virulence of a disease or poison is its ability to harm or kill people or animals.
Medical authorities were baffled, both as to its causes and its virulence.

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