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Henna by Sienna. Henna is a natural dye produced from the leaves of the henna plant, a small flowering shrub (scientific name: Lawsonia inermis). The henna plant grows all over the world in hot, dry areas, from North Africa across the Middle East and throughout Southern Asia.
Full Definition of HENNA. 1. : a reddish-brown dye obtained from leaves of the henna plant and used especially on hair. 2. : an Old World tropical shrub or small tree (Lawsonia inermis) of the loosestrife family with small opposite leaves and panicles of fragrant usually white flowers.See henna defined for English-language learners.ull Definition of HENNA. 1. : a reddish-brown dye obtained from leaves of the henna plant and used especially on hair. 2. : an Old World tropical shrub or small tree (Lawsonia inermis) of the loosestrife family with small opposite leaves and panicles of fragrant usually white flowers.