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vir·u·lent -lənt adj
1 a) marked by a rapid, severe, and malignant course <a \virulent infection>
b) able to overcome bodily defense mechanisms <a \virulent pathogen>
2) extremely poisonous or venomous: NOXIOUS
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vir·u·lent (virґu-lənt) [L. virulentus, from virus poison] pertaining to or characterized by virulence; exceedingly pathogenic or deleterious.Medical dictionary. 2011.