virulent

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vir·u·lent

(vir'yū-lĕnt),
Extremely toxic, denoting a markedly pathogenic microorganism.
[L. virulentus, poisonous]
Farlex Partner Medical Dictionary © Farlex 2012

virulent

(vîr′yə-lənt, vîr′ə-)
adj.
1.
a. Characterized by, causing, or promoting the rapid onset of severe illness. Used of a disease or toxin.
b. Capable of causing disease by aggressively interfering with the immune system of the host. Used of a pathogen.
2. Extremely hostile or malicious: virulent criticism; a virulent bigot.

vir′u·lence, vir′u·len·cy n.
vir′u·lent·ly adv.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

vir·u·lent

(vir'yū-lĕnt)
Extremely toxic, denoting a markedly pathogenic microorganism.
[L. virulentus, poisonous]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012