American Heritage Dictionary
(4)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
P. sojae isolates that are virulent (V) or avirulent (A) on— PLoS ONE Alerts: New Articles
Indicated at the top of the figure is P. sojae race tested, the Avh92 allele present, and the disease outcome, virulent (V), avirulent— PLoS ONE Alerts: New Articles
Nature reports that hurricanes are becoming more virulent, and global warming may be the cause.— The Chicago Blog
He felt it unthinkable that even the most sheltered white suburbanite would not recognize it for what it was -- virulent racism.— 1UP RSS feed

American Heritage Dictionary (1)
Century 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 about twice a month.
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