Oud is a resinous heartwood from the aquilaria species, an evergreen in the Thymelaeaceae family native to South East Asia. The heartwood is harvested and used for medicinal and perfumery purposes, many of a traditional or religious nature. The resinous heartwood only occurs in certain trees as a result of a fungal infection due to wounding. Only the aquilaria trees with this infection actually have the aloeswood. Other common English names for oud are aloeswood, calambac, agarwood, gaharu, and eagleswood.
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