Webster 1913 Edition
viruspoison: cf. F.
Extremely poisonous or venomous; very active in doing injury.
A contagious disorder rendered more
Sir W. Scott.
Very bitter in enmity; actuated by a desire to injure; malignant;
Webster 1828 Edition
1.Extremely active in doing injury; very poisonous or venomous. No poison is more virulent than that of some species of serpents.
2.Very bitter in enmity; malignant; as a virulent invective.