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From The Collaborative International Dictionary of English v.0.48:
Virulence \Vir"u*lence\, Virulency \Vir"u*len*cy\, n. [Cf. F. virulence, L. virulentia an offensive odor, a stench.] 1. The quality or state of being virulent or venomous; poisonousness; malignancy. [1913 Webster] 2. Extreme bitterness or malignity of disposition. "Refuted without satirical virulency." --Barrow. [1913 Webster] The virulence of one declaimer, or the profundities and sublimities of the other. --I. Taylor. [1913 Webster]