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tea tree(te´ tre″) a tree, Melaleuca alternifolia, native to eastern Australia, from whose leaves and branches tea tree oil is obtained.
1. A melaleuca tree (Melaleuca alternifolia) of Australia whose leaves yield an oil used in cosmetics and for medicinal purposes.
2. Any of various evergreen shrubs or small trees of the genus Leptospermum, native to Southeast Asia and Australasia, having showy flowers and small needlelike leaves formerly used to make a tealike beverage.
tea treetea tree oil
a volatile oil from Melaleuca spp. used widely in topical preparation, including pet shampoos, for its antiseptic and insect repellent properties.