(chemistry) An alkyl aldehyde with molecular formula C₅H₁₀O, used in flavourings, resin chemistry, and rubber accelerators.

(organic chemistry) An aliphatic hydrocarbon of chemical formula C₅H₁₂; either of the three isomers n-pentane, methyl-butane (isopentane), and di-methyl-propane (neopentane); volatile liquids under normal conditions.

plural of pentane

(organic chemistry) The saturated aliphatic hydrocarbon (CH₃(CH₂)₃CH₃).

pentanal