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St.-John's-wort

[seynt-jonz-wurt, -wawrt]
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noun
  1. any of various plants or shrubs of the genus Hypericum, having yellow flowers and transparently dotted leaves.

Origin of St.-John's-wort

First recorded in 1745–55; so named because gathered on St. John's Eve to ward off evil
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018