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Saint-John's-wort Definition

Saint-John's-wort (sānt jänz′wʉrt)

noun

any of a genus (Hypericum) of ornamental plants of the Saint-John's-wort family, with usually yellow flowers and numerous stamens

Etymology: after Saint John + wort: reason for name uncert.

adjective

designating a family (Guttiferae, order Theales) of dicotyledonous trees, shrubs, and plants used for timber, in drugs, etc.