Source : Webster's Revised Unabridged Dictionary (1913)

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.