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Webster 1828 Edition
Ulency
VIR'ULENCE
,'ULENCY,Noun.
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.