The Collaborative International Dictionary of English v.0.48:

Hecdecane \Hec"de*cane\, n. [Gr. ? six + ? ten.] (Chem.)
   A white, semisolid, spermaceti-like hydrocarbon, C16H34, of
   the paraffin series, found dissolved as an important
   ingredient of kerosene, and so called because each molecule
   has sixteen atoms of carbon; -- called also hexadecane.
   [1913 Webster]