cold sore cold sober • cold spell · · · Info · Definitions · Synonyms · Characters · · cold sore · · Text Common · · Latin · · Scripts 9 · · Length 2 · · Syllables Definitions · · · (noun) caused by herpes simplex virus type 1 (HSV-1). Synonyms: oral herpes, herpes labialis, cold sore, fever blister. · · Noun Definition 1 Synonyms · · · oral herpes · · Synonym 1 herpes labialis · · Synonym 2 fever blister · · Synonym 3 Characters · · space U+0020 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 l latin small letter l U+006C o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073