mu ‧ cous mem ‧ brane /ˌmjuːkəs ˈmembreɪn/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Language: Latin ; Origin: mucosus , from mucus ; ⇨ ↑ mucus ]
the thin layer of skin that covers some inner parts of the body, such as the inside of the nose, and produces mucus