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From The Collaborative International Dictionary of English v.0.48:
Virulent \Vir"u*lent\, a. [L. virulentus, fr. virus poison: cf. F. virulent. See Virus.] 1. Extremely poisonous or venomous; very active in doing injury. [1913 Webster] A contagious disorder rendered more virulent by uncleanness. --Sir W. Scott. [1913 Webster] 2. Very bitter in enmity; actuated by a desire to injure; malignant; as, a virulent invective. [1913 Webster]