Definition of hypericin in English:

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Pronunciation: /hʌɪˈpɛrɪsɪn/


[mass noun]
A substance found in St John’s wort, credited with chemical and pharmacological properties similar to those of antidepressants.
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.

For editors and proofreaders

Line breaks: hy¦peri|cin

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