Source : Webster's Revised Unabridged Dictionary (1913)

Acetal \Ac"e*tal\, n. [Acetic + alcohol.] (Chem.)
   A limpid, colorless, inflammable liquid from the slow
   oxidation of alcohol under the influence of platinum black.

Source : WordNet®

acetal
     n : any organic compound formed by adding alcohol molecules to
         aldehyde molecules