Hen"na (?), n. [Ar. hinnā alcanna (Lawsonia inermis or alba). Cf. Alcanna, Alkanet, Orchanet.]

1. (Bot.) 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 nails and fingers, the manes of horses, etc.

2. (Com.) The leaves of the henna plant, or a preparation or dyestuff made from them.

• A reddish plant substance used for temporary tattoos and hair coloring. Hair colorings range from bright red to earth brown to near black.
  
• (colour) a rich reddish-brown colour.
       henna colour:   
  
• (colour) of a rich reddish-brown colour.