American Heritage Dictionary
(4)
Century Dictionary
(13)
GNU Webster's 1913
(2)
WordNet
(4)
Elsewhere on the web
The only group that exceeds the Squealers in my vitriol are the Dukies ( "Pukies" fits just fine and "Dukie" Vitel will be joining Kook and Irsay in my idle musings).— Blog updates
Needless to say, I'm not one of The Rich that all of this vitriol is aimed at, but the thought occurs to me that if I keep this new attitude up I might become one some day … at which point I can look forward to paying enough to cover the half of the country that pays nothing, and have my charitable efficiency rated by Mr. Berg.— Latest Articles
The term vitriol is also an acronym for "Visita Interiora Terrae Rectificando Invenies Occultum Lapidem Visit the interior of the earth, and by rectifying you will find the hidden stone."— HogwartsProfessor.com
You don't suppose that hidden beneath all the vitriol is a secret admirer?

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.
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