virulent
vir·u·lent
adj \-lənt\Definition of VIRULENT
1
a : marked by a rapid, severe, and malignant course <a virulent infection> b : able to overcome bodily defense mechanisms <a virulent pathogen>
2
: extremely poisonous or venomous : noxious
Learn More About
Ask The Editor Videos
Seen & Heard 
What made you want to look up virulent? Please tell us where you read or heard it (including the quote, if possible).
