Oudh, also known as oud, oodh, agar, aloeswood or lign-aloes, is a dark resinous heartwood that forms in Aquilaria and Gyrinops trees.
These tree produces a dark aromatic resin in response to the attack of a mould, which results in a very dense, dark, resin embedded heartwood.
The resin oodh embedded wood is commonly called gaharu, jinko, aloeswood, agarwood, or oudh and is valued in many cultures for its distinctive fragrance, and thus is used for making incense and perfumes.
Oudh frgarance is an aphrodisiac, both in oil form, and as incense.
Chinese medicine uses powdered Agarwood as a treatment for cirrhosis of the liver and for other medicines. It has also been used as a treatment for lung and stomach tumors.