tetracosane

from The Century Dictionary.

• noun A colorless hydrocarbon of the methane series, CH3(CH₂)₂₂CH₃, prepared by the action of hydriodic acid and phosphorus on tho dichlorid C₂₄H₄₈Cl₂. It melts at 51.1° C., and boils at 243° C. under 15 millimeters pressure.

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

• noun An alkane hydrocarbon with the structural formula CH3(CH2)22CH3.