Source : Webster's Revised Unabridged Dictionary (1913)

Undecane \Un"de*cane\, n. [L. undecim eleven.] (Chem.)
   A liquid hydrocarbon, {C11H24}, of the methane series, found
   in petroleum; -- so called from its containing eleven carbon
   atoms in the molecule.

Endecane \En"de*cane\, n. [Gr. ? eleven.] (Chem.)
   One of the higher hydrocarbons of the paraffin series,
   {C11H24}, found as a constituent of petroleum. [Written also
   {hendecane}.]

Hendecane \Hen"de*cane\, n. [Gr. "e`ndeka eleven.] (Chem.)
   A hydrocarbon, {C11H24}, of the paraffin series; -- so called
   because it has eleven atoms of carbon in each molecule.
   Called also {endecane}, {undecane}.