Basic Guidelines For English Spellings
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See US English definition of virulent
See UK English definition of virulent
See Spanish definition of virulento
1‘some plant varieties can withstand being sprayed by the most virulent herbicides’
non-toxic, harmless, safe
2‘a virulent epidemic of cholera swept through London’
non-contagious
3‘a virulent attack on contemporary morals’
amicable, benevolent