Definition of Saint-Peter's-wort 

1a : a plant of the genus Ascyrum (as A. stans of the southeastern U.S.)

b [ so called from its blooming near the time of St. Peter's feast day (June 29) ] : a European Saint-John's-wort (Hypericum quadrangulum)

2 [ so called from the resemblance of the leaves to keys, traditional appurtenances of St. Peter ] : cowslip sense 1a

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