any substance that softens the skin by slowing evaporation of water. Sesame, almond, and olive oils were used in ancient Egypt; beeswax, spermaceti, almond oil, borax, and rosewater in Greece; and lanolin (sheep fat) in medieval Europe. Modern emollients include petrolatum, zinc oxide, paraffin, mineral oil, glycerin, beeswax, olive oil, coconut oil, lanolin, cocoa butter, and such synthetics as butyl stearate and diglycol laurate.