herbal mucilaginous or oily principles which are used in solution to soothe and protect irritated mucus membranes or other tissues.

Herbal substances taken internally which soften and smooth inflamed mucous membranes and are used to treat coughs and minor throat irritations: blessed thistle, borage, coltsfoot, goldenseal root, hound's tongue, and Solomon's seal.

Herbs used to relieve internal inflammations, provide a protective coating and allay irritation of the membranes.