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Monoglyceride. A fat molecule (q.v.) in which only one of the three hydroxyl groups (q.v.) of glycerol (q.v.) is esterified to a fatty acid (q.v.). By being partially water-soluble and more fully fat-soluble, it acts as a surfactant (q.v.) and finds important applications as an emulsifier (q.v.) and antistaling agent (q .v).