The Collaborative International Dictionary of English v.0.48:

ethal \eth"al\, n. [Ether + alcohol: cf. F. ['e]thal.] (Chem.)
   A white waxy solid, C16H33.OH; -- called also cetyl
   alcohol and cetylic alcohol. See Cetylic alcohol, under
   Cetylic.
   [1913 Webster]