diethylene glycol

noun
di·​eth·​yl·​ene glycol | \ -ˌeth-ə-ˌlēn- How to pronounce diethylene glycol (audio) \

Medical Definition of diethylene glycol

: a sweet toxic syrupy compound C4H10O3 used chiefly as a solvent, humectant, and plasticizer and in the production of polyester resins