henna (n.)youdaoicibaDictYouDict[henna 词源字典]
c. 1600, "dye or cosmetic from the henna plant," from Arabic hinna, name for the small thorny tree (Egyptian Privet, Lawsonia inermis), the leaves of which are used to make the reddish dye; said to be of Persian origin. Related: Hennaed (1860).[henna etymology, henna origin, 英语词源]