[¦te·trə′eth·ə‚lēn ′glī‚kȯl] (organic chemistry) HO(C2H4O)3C2H4OH A combustible, hygroscopic, colorless, water-soluble liquid, boils at 327°C; used as a nitrocellulose solvent and plasticizer and in lacquers and coatings. Abbreviated TEG.SeeTEGSeeTEG