demulc- +

(Latin: to soothe)

demulce
1. To sooth.
2. To soften or to pacify.
demulceate
To sooth and to soften.
demulceation
Soothing and softening.
demulcent
1. A reference to the soothing nature of medicines.
2. A description of things like a soothing melody or a soothing demeanor.
3. To soothe; to mollify; to pacify; to soften.
demulcetive
Smoothness and mollification.
demulcify
To smooth and to soothe the surface.
demulcing
1. Alleviating and smoothing.
2. Allaying irritation of surfaces.
demulsibility
An agent that is capable of producing a protective effect on mucous membranes and relieves irritation.

Demulcents are generally suspensions of gums or proteins that coat the surface of the mucous membranes.