Definition of St John’s Wort noun from the Oxford Advanced Learner's Dictionary

 

St John’s Wort

 noun
noun
BrE BrE//snt ˌdʒɒnz ˈwɜːt//
 
; NAmE NAmE//seɪnt ˌdʒɑːnz ˈwɜːrt//
 
[uncountable, countable] Herbs and spices
 
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a herb with yellow flowers, used in medicines See related entries: Herbs and spices Word Originso named because some species come into flower near the feast day of St John the Baptist (24 June).
See the Oxford Advanced American Dictionary entry: St John’s Wort