The present participle of 'henna'; the act of applying henna dye to hair, skin, or nails for color and decoration.
From 'henna' + '-ing' (Old English -ing, gerund and present participle suffix), creating the continuous action form of the verb.
The tradition of hennaing goes back thousands of years—Egyptian mummies show henna stains, and it's still a major part of celebration ceremonies from Morocco to India to Pakistan!
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