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Definition of herpes simplex noun from the Oxford Advanced American Dictionary

 

herpes simplex

 noun
noun
NAmE//ˌhərpiz ˈsɪmplɛks//
 
[uncountable]
 
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an infection caused by a virus, that can cause sore areas around the mouth or on the genitals
See the Oxford Advanced Learner's Dictionary entry: herpes simplex