Vir″u‐lent (?), a. [L. virulentus, fr. virus poison: cf. F. virulent. See Virus.] 1. Extremely poisonous or venomous; very active in doing injury.
A contagious disorder rendered more virulent by uncleanness. Sir W. Scott.
2. Very bitter in enmity; actuated by a desire to injure; malignant; as, a virulent invective.