Collins Concise English Dictionary © HarperCollins Publishers::
Saint John's wort n
usually abbreviated to: St John's wort
  1. any of numerous shrubs or herbaceous plants of the temperate genus Hypericum, such as H. perforatum, having yellow flowers and glandular leaves: family Hypericaceae
  2. a preparation of this plant often used to treat mild depression
    See also tutsan
Etymology: 15th Century: so named because it was traditionally gathered on Saint John's Eve (June 23) as a protection against evil spirits
'Saint John's wort' also found in these entries:

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