Henna \Hen"na\, n. [Ar. hinn[=a] alcanna ({Lawsonia inermis}
syn. {Lawsonia alba}). Cf. {Alcanna}, {Alkanet}, {Orchanet}.]
[1913 Webster]
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.
[1913 Webster]
2. (Com.) The leaves of the henna plant, or a preparation or
dyestuff made from them.
[1913 Webster]