Definition of mucous membrane
: a membrane rich in mucous glands specifically : one that lines body cavities and passages (as of the gastrointestinal or respiratory tract) which communicate directly or indirectly with the outside of the body : mucosa Pruritus and congestion involving mucous membranes of the eyes, nose, and mouth are frequently observed, and swelling of the lips or tongue may impair swallowing and ventilation. — Bruce S. Bochner et al.
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