Definition of mucosa
: 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 : mucous membrane … to maximize the absorptive area of the epithelium, the mucosa of the small intestine is remodeled into an intricate array of finger or leaf-like protrusions, known as villi, which extend into the lumen. — Benjamin D. Simons Inhibition of neuraminidase prevents inactivation of influenza virus by respiratory mucus and likely facilitates infection of the airway mucosa. — Frederick G. Hayden et al.
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