Webster’s Revised Unabridged Dictionary · 1913
Demulcent
De·mul′cent (dē·mŭl′sent), a. [L. demulcens, p. pr. of demulcere.] Softening; mollifying; soothing; assuasive; as, oil is demulcent.
De·mul′cent, n. (Med.) 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.