from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Extremely infectious, malignant, or poisonous. Used of a disease or toxin.
- adj. Capable of causing disease by breaking down protective mechanisms of the host. Used of a pathogen.
- adj. Bitterly hostile or antagonistic; hateful: virulent criticism. See Synonyms at poisonous.
- adj. Intensely irritating, obnoxious, or harsh.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. highly infectious, malignant, or deadly.
- adj. Hostile to the point of being venomous; intensely acrimonious.
from the GNU version of the Collaborative International Dictionary of English
- adj. Extremely poisonous or venomous; very active in doing injury.
- adj. Very bitter in enmity; actuated by a desire to injure; malignant.
from The Century Dictionary and Cyclopedia
- Full of virus; extremely poisonous or venomous.
- Due to the action of a virus: as, a virulent inoculation.
- Very bitter or spiteful; malignant: as, a virulent invective; a virulent libel.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. harsh or corrosive in tone
- adj. extremely poisonous or injurious; producing venom
- adj. infectious; having the ability to cause disease
Middle English, from Latin vīrulentus, from vīrus, poison.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin virus ("poison, slime, venom"). (Wiktionary)