Virulence

VIR'ULENCE, 'ULENCY, noun [from virulent.]

1. That renders it extremely active in doing injury; acrimony; malignancy; as the virulence of poison.

2. Acrimony of temper; extreme bitterness or malignity; as the virulence of enmity or malice; the virulence of satire; to attack a man with virulence