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Noun
propylene glycol
propanediol
Definition: a sweet colorless, viscous, hygroscopic liquid used as an antifreeze and in brake fluid and also as a humectant in cosmetics and personal care items although it can be absorbed through the skin with harmful effects
Definition: Any of four diols derived from propane, usually the forms 1,2-propanediol and 1,3-propanediol, but especially 1,2-propanediol known as propylene glycol