- mucus, mucous secretion - 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
--1 is a kind of secretion
--1 has substances: mucin
--1 has particulars:phlegm, sputum; snot; booger; leukorrhea, leucorrhea