Definition of st. john's wort in English English dictionary
(Botanik, Bitkibilim) St John's wort is the plant species Hypericum perforatum, and is also known as Tipton's Weed, Chase-devil, or Klamath weed
A herbaceous plant or shrub with distinctive yellow five-petalled flowers and paired oval leaves (Genus Hypericum). So named because some species come into flower near the feast day of St John the Baptist (24 June)
any of numerous plants of the genus Hypericum having yellow flowers and transparently dotted leaves; traditionally gathered on St John's eve to ward off evil