GNU Collaborative International Dictionary of English

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1.       
   Herpes simplex (?), n. (Med.) either of two forms of herpesvirus infection, distinguished as being caused by herpes simplex virus type 1 (HSV-1), which causes mostly sores and eruptions around the mouth (cold sores and fever blisters) and at other points above the waist, and herpes simplex virus type 2 (HSV-2), causing genital herpes.  HSV-1 is also known in some cases to cause genital herpes infections.
   
   [PJC]