Source : Webster's Revised Unabridged Dictionary (1913)

      (b) Any similar oxide of hydrocarbon radicals; as, amyl
          ether; valeric ether.

   {Complex ether}, {Mixed ether} (Chem.), an oxide of two
      different radicals in the same molecule; as, ethyl methyl
      ether, {C2H5.O.CH3}.

   {Compound ether} (Chem.), an ethereal salt or a salt of some
      hydrocarbon as the base; an ester.

   {Ether engine} (Mach.), a condensing engine like a steam
      engine, but operated by the vapor of ether instead of by
      steam.