Hen·na n.
  1. Bot. A thorny tree or shrub of the genus Lawsonia (Lawsonia alba).  The fragrant white blossoms are used by the Buddhists in religious ceremonies.  The powdered leaves furnish a red coloring matter used in the East to stain the nails and fingers, the manes of horses, etc.
  2. Com. The leaves of the henna plant, or a preparation or dyestuff made from them.
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