What is Oud? ⁃ Oud is one of the most expensive and desirable perfume ingredients in the world. ⁃ Oud’ literally means ‘from wood’ in Arabic.  ⁃ It comes from Agar trees infected by a parasitic mold known as Phialophora parasitica, the tree will respond by creating a dark, fragrant resin and entrapping the parasite within. Once this...