Webster's English Dictionary

Enter the word to look up:

virulent

vir.u.lent \-l*nt\ aj [ME, fr. L virulentus, fr. virus poison] 1a: marked 
   by a rapid, severe and malignant course {a ~ infection)> 1b: able to 
   overcome bodily defensive mechanisms {a ~ pathogen}  2: extremely poisonous 
   or venomous : NOXIOUS  3: full of malice : MALIGNANT  4: objectionably 
   harsh or strong  - vir.u.lent.ly av