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
      [1913 Webster]

            A contagious disorder rendered more virulent by
            uncleanness.                          --Sir W.
      [1913 Webster]

   2. Very bitter in enmity; actuated by a desire to injure;
      malignant; as, a virulent invective.
      [1913 Webster]
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