henna

1. A shrub, Lawsonia inermis, having fragrant reddish flowers. (countable)
2. A flower of this plant. (countable, uncountable)
3. A reddish plant substance, prepared from the dried leaves of this plant, used for temporary tattoos and hair coloring. Hair colorings range from bright red to earth brown to near black. (countable, uncountable)
4. A rich reddish-brown colour. (countable, uncountable)

Plural hennas