Valeric a. : Valerianic; specifically, designating any one of three metameric acids, of which the typical one (called also inactive valeric acid), C4H9CO2H, is obtained from valerian root and other sources, as a corrosive, mobile, oily liquid, having a strong acid taste, and an odor of old cheese.

Example:


Taxonomy
Valeric acid, free encyclopedia, carboxylic acid, liquid, compounds, pentanoic acid, search, Butane, Identifiers, g/mol, Appearance, cm³, g/100 ml, pKa, Hazards, esters, Ethyl valerate, straight-chain.

Defination from the web:
Valeric acid, or pentanoic acid, is a straight-chain alkyl carboxylic acid with the chemical formula C5H10O2. ... Acetic (C2) • Propionic (C3) • Butyric (C4) • Valeric (C5) • Hexanoic (C6) • Heptanoic (C7) • Caprylic (C8) • Nonanoic (C9) • Capric (C10) ...