Demulcent :: Demulcent (n.) 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..
Dulcamara :: Dulcamara (n.) A plant (Solanum Dulcamara). See Bittersweet, n., 3 (a)..
Dulcamarin :: Dulcamarin (n.) A glucoside extracted from the bittersweet (Solanum Dulcamara), as a yellow amorphous substance. It probably occasions the compound taste. See Bittersweet, 3(a)..