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virulence

vir·u·lence [ vryələnss, vrələnss ] or vir·u·len·cy [ vryələnssee, vrələnssee ]


noun 
Definition:
 
1. poisonousness: the quality of being extremely poisonous, infectious, or damaging, or the extent to which a disease or toxin possesses this quality

2. bitterness: the quality of being bitter, malicious, or hostile

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