virulent
Americanadjective
adjective
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(of a microorganism) extremely infective
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(of a disease) having a rapid course and violent effect
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extremely poisonous, injurious, etc
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extremely bitter, hostile, etc
Other Word Forms
Etymology
Origin of virulent
1350–1400; Middle English verulent < Latin vīrulentus, equivalent to vīr ( us ) poison ( see virus) + -ulentus -ulent
Explanation
A virulent disease is one that's infectious, spreading, and making lots of people sick, while a virulent rant is just a verbal attack, causing sickness of the emotional kind. Either way, something virulent puts a strain on the people who get it. Two meanings come out of the roots for virulent: "poisonous" and "spiteful." The virus-carrying meaning of virulent often gets combined with strain, such as in a "virulent strain of the flu." Those who aren’t carrying disease but are still considered virulent most likely lash out at others with a biting tone. Unleashing acid-tongued words on someone would be considered a virulent attack.
Vocabulary lists containing virulent
100 SAT Words Beginning with "V"
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"A Rose for Emily" by William Faulkner
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The Immortal Life of Henrietta Lacks
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The traditional method of creating flu vaccines involves growing the virus in eggs - but this can be a problem when there are virulent avian flu strains which can kill the eggs used during manufacturing.
From BBC • Apr. 21, 2026
We must confront the causal factors of antisemitism honestly and address antisemitism where it is most common and most virulent.
From Los Angeles Times • Mar. 24, 2026
But time travel is an imperfect science, and the technician overseeing the process is delirious from a virulent new strain of flu, so Kivrin is accidentally dropped into 1348, the year of the Black Death.
From The Wall Street Journal • Feb. 17, 2026
She explained that the vaccine strain appears smooth and stable at the surface, while the virulent strain has a noticeably uneven, textured exterior.
From Science Daily • Nov. 27, 2025
County officials say they eliminated the springs out of concern that bathers might become gravely ill from virulent microbes thought to flourish in the thermal pools.
From "Into the Wild" by Jon Krakauer
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
