Definitions

1. noun

a layer of mucous membrane forming the lining of certain cavities or organs, especially the respiratory, alimentary, and genitourinary tracts.

“The doctor examined the mucosa of the patient’s nose to diagnose the cause of her congestion.”

2. noun

the mucous membrane itself, especially when considered as a layer of tissue.

“The surgeon carefully removed the damaged mucosa from the patient’s esophagus.”