mucous membrane
noun
: 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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Merriam-Webster unabridged
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