Webster's English Dictionary

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virulence

vir.u.lence or vir.u.len.cy \'vir-(y)*-l*n(t)s\ \-l*n-se-\ n : the quality 
   or state of being virulent : as  : extreme bitterness or malignity of 
   temper  : VENOMOUSNESS, MALIGNANCY  : the relative capacity of a pathogen 
   to overcome body defenses