Definition of St. John's wort in English:

St. John's wort

(also St. Johns wort)

noun

  • A herbaceous plant or shrub with distinctive yellow five-petaled flowers and paired oval leaves, used in medicinal preparations to treat various disorders, including depression.

    • ‘Psychiatrist Dr David Wheatley has published two independent clinical trials which shows that 60% of patients with mild to moderate depression respond to St John's wort.’
    • ‘Products such as St John's wort may act as a mild monoamine oxidase inhibitor or as a serotonin reuptake inhibitor.’
    • ‘The widely used herbal remedy St John's wort appears to amplify the action of the popular blood-thinning drug clopidogrel, sold as Plavix, a small new clinical study finds.’
    • ‘Taken internally, St John's wort is used for mild to moderate depressive moods, anxiety, and nervous unrest.’
    • ‘Marie-Ange began by lighting the candle, which was a hollow tube infused with honey and herbs including sage, St John's wort and camomile, which are believed to have medicinal and healing properties.’

Origin

So named because some species come into flower near the feast day of St John the Baptist (24 June).