Definition of hypericin in English:


Line breaks: hy¦peri|cin
Pronunciation: /hʌɪˈpɛrɪsɪn


[mass noun]
  • A substance found in St John’s wort, credited with chemical and pharmacological properties similar to those of antidepressants.
    • A polycyclic quinone; chemical formula: C30H14O8
    More example sentences
    • St.John's Wort contains hypericin, which inhibits monoamine oxidase, a chemical associated with depression.
    • The antitumor properties of St. John's wort are attributed to hypericin, which is a powerful photosensitizer.
    • Today, St. John's wort standardized to 0.3% hypericin easily outsells its pharmaceutical rival, Prozac, and its derivatives.


early 20th century: from hypericum + -in1.

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a small amount; a little