an alkane hydrocarbon having three isomers, esp the isomer with a straight chain of carbon atoms (n-pentane) which is a colourless flammable liquid used as a solvent. Formula: C5H12
pentane in American English
(ˈpɛnˌteɪn)
noun
any of three known isomeric, colorless alkanes, C5H12, occurring in petroleum, etc.: used as a solvent, in low-temperature thermometers, etc.