Definition of henna

• n. - A thorny tree or shrub of the genus Lawsonia (L. 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 hails and fingers, the manes of horses, etc.
• n. - The leaves of the henna plant, or a preparation or dyestuff made from them.