​HOREHOUND, the Water, or Gypsywort, Lycopus Europæus, L. an indigenous perennial plant, which grows on sandy ground, on the banks of streams and ponds; it flowers from July to September.

The French manufacturers are chiefly indebted to this plant for the deep black colour of their cloth; its juice imparts a permanent dye to wool, silk and linen, and is much used by travelling gypsies, for the purpose of staining their faces.