noun Chemistry.
- any of several isomeric organic acids having the formula C5H10O2, the common one being a liquid of pungent odor obtained from valerian roots: used chiefly as an intermediate in perfumery.
noun
- another name for pentanoic acid
- A colorless, liquid organic acid that occurs in four isomeric forms and has a disagreeable odor. It occurs naturally in oils from certain marine animals and plants, and is used in flavorings, perfumes, plasticizers, and pharmaceuticals. Chemical formula: C5H10O2.