demulcent

Demulcent derives from the Latin verb demulcēre, meaning "to soothe." Demulcēre in turn comes from a combination of the prefix de- and mulcēre, an earlier verb that also means "to soothe." As an adjective, demulcent often applies to the soothing nature of some medicines, but you can also use it to describe such things as a soothing voice or a soothing demeanor. The noun demulcent is used for a gelatinous or oily substance that is capable of soothing inflamed or abraded mucous membranes and protecting them from further irritation.