humectant

Noun
  1. Any substance that is added to another substance to keep it moist (synset 114932834)
    is a type of: substance - a particular kind or species of matter with uniform properties
    subtypes: propanediol, propylene glycol - 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

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