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Synonyms
vir·u·lent (vîŕyə-lənt, vîŕə-)

[Middle English, from Latin vīrulentus, from vīrus, poison.]

adjective 

    1. Extremely infectious, malignant, or poisonous. Used of a disease or toxin.
    2. Capable of causing disease by breaking down protective mechanisms of the host. Used of a pathogen.
  2. Bitterly hostile or antagonistic; hateful: virulent criticism. See synonyms at poisonous
  3. Intensely irritating, obnoxious, or harsh.

derivatives

viŕu·lence
noun
viŕu·lent·ly
adverb