Pronunciation: (vir'yu-luns, vir'u-), [key]
1. quality of being virulent.
a. the relative ability of a microorganism to cause disease; degree of pathogenicity.
b. the capability of a microorganism to cause disease.
3. venomous hostility.
4. intense sharpness of temper. Also,vir'u•len•cy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.