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From Biology-Online Dictionary | Biology-Online Dictionary
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1. (Science: botany) 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 colouring matter used in the East to stain the hails and fingers, the manes of horses, etc.

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

Origin: ar. Hinna alcanna (lawsonia inermis or alba). Cf. Alcanna, Alkanet, orchanet.