a medicine or ointment that soothes irritated mucous membrane
See demulcent in American Heritage Dictionary 4
(dĭ-mŭlˈsənt)
adjective
Serving to soothe or soften.
noun
A soothing, usually mucilaginous or oily substance, such as glycerin or lanolin, used especially to relieve pain in inflamed or irritated mucous membranes.