n (1) Gum benzoin, as it is more commonly known, is a spirit-soluble resin which appears on the market as Siam, Palembang, Padang, Sumatra and Penang benzoins. It has a very pleasant “vanilla” smell, and it is used partly on account of this, and partly as a plasticizing resin in spirit varnishes. Benzoin is obtained as an exudation from a tree as a result of deliberate incision. See also Belly Benzoin. (2) (Deprecated) Another name for petroleum benzine.