Vir'-u-lent, a.

a. [Fr. virulent, Sp., Pg., & It. virulento, Lat. virulentus, from virus, q. v.]

1. Extremely poisonous or venomous; very active in doing injury. “A contagious disorder rendered more virulent by uncleanness.” W. Scott.
2. Very bitter in enmity; malignant; as, a virulent invective.