tricosane

from The Century Dictionary.

• noun A colorless hydrocarbon, CH₃(CH₂)₂₁CH₃, of the methane series. It is contained in paraffin from shale and in petroleum, and may be prepared by the action of hydriodic acid and phosphorus on the chlorid, C₂₂H₄₆Cl₂. It crystallizes in lustrous leaflets, melts at 47.7° C, and boils at 234° C. under 15 millimeters pressure.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry Any of very many isomers of the aliphatic hydrocarbon having twenty-three carbon atoms, but especially n-tricosane CH3(CH2)21CH3