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The Collaborative International Dictionary
Tetrakosane

Tetrakosane \Tet"ra*ko*sane`\, n. [Tetra- + Gr. ? twenty.] (Chem.) A hydrocarbon, C24H50, resembling paraffin, and like it belonging to the marsh-gas series; -- so called from having twenty-four atoms of carbon in the molecule.

Wiktionary
tetrakosane

n. (alternative spelling of tetracosane English)