Synonyms for Mucous Secretion (same or very similar meaning)
WordNet sense 1 (protective secretion of the mucous 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):
mucusFrom the ODE community, based on WordNetadd/edit