- a colorless liquid, C5H12O, consisting of a mixture of two or more isomeric alcohols, derived from the pentanes, and used as a solvent and intermediate for organic synthesis: the main component of fusel oil.
- a colourless flammable liquid existing in eight isomeric forms that is used as a solvent and in the manufacture of organic compounds and pharmaceuticals. Formula: C 5 H 11 OH
- Any of various colorless oils derived from pentane, one of which is the main constituent of fusel oil. Chemical formula: C5H12.