any of a class of glycoproteins found in saliva, gastric juice, etc., that form viscous solutions and act as lubricants or protectants on external and internal surfaces of the body.
Main Entry: mu·cin Pronunciation: 'myüs-&n Function: noun : any of a group of mucoproteins that are found in various human andanimal secretions and tissues (as in saliva, the lining of the stomach, and the skin) and that are white or yellowish powders when dry and viscid when moist mucin>
Main Entry: mu·cin·oid Pronunciation: 'myü-s&n-"oid Function: adjective : resembling mucin