Ethylene Glycols

**Definition:** An ethylene compound with two hydroxy groups (-OH) located on adjacent carbons. They are viscous and colorless liquids. Some are used as anesthetics or hypnotics. However, the class is best known for their use as a coolant or antifreeze.

**Tree numbers:** - D02.033.455.250

**Synonyms:** - Dihydroxyethanes - Ethanediols