de·mul·cent 
(dĭ-mŭlsənt)
(dĭ-mŭlsənt)adj.
Serving to soothe or soften.
n.
A soothing, usually mucilaginous or oily substance, such as glycerin or lanolin, used especially to relieve pain in inflamed or irritated mucous membranes.
[Latin dēmulcēns, dēmulcent-, present participle of dēmulcēre, to soften : dē-, de- + mulcēre, to stroke.]