Demulcent

Webster's Dictionary of the English Language

·adj Softening; mollifying; soothing; assuasive; as, oil is demulcent.

II. Demulcent ·noun A substance, usually of a mucilaginous or oily nature, supposed to be capable of soothing an inflamed nervous membrane, or protecting it from irritation. Gum Arabic, glycerin, olive oil, ·etc., are demulcents.