Synonyms: mucous secretion, mucus
Definition: protective secretion of the mucus membranes; in the gut it lubricates the passage of food and protects the epithelial cells; in the nose and throat and lungs it can make it difficult for bacteria to penetrate the body through the epithelium
Similar words: secretion
Definition: a functionally specialized substance (especially one that is not a waste) released from a gland or cell