virulency
Vir"u*lence, Vir"u*len*cy, n. Etym: [Cf. F. virulence, L. virulentia an offensive odor, a stench.] 1. The quality or state of being virulent or venomous; poisonousness; malignancy. 2. Extreme bitterness or malignity of disposition. "Refuted without satirical virulency." Barrow. The virulence of one declaimer, or the profundities and sublimities of the other. I. Taylor.