noun.
Either of two diols derived from propane, but especially 1,2-propanediol known as propylene glycol
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
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