Webster’s Revised Unabridged Dictionary · 1913
Hecdecane
Hec′de·cane (hĕk′dē·kān), n. [Gr. ἕξ six + δέκα 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.