mucin

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Viscous mucoprotein secreted in the saliva and throughout the intestinal tract; the main constituent of mucus.

any of a group of widely distributed glycoproteins of high M_r that are secreted by various animal mucous cells and glands; they occur, e.g., in saliva, gastric juice, and intestinal juice. Mucins form viscous solutions that act as lubricants and protectants of the linings of body cavities and of the skin.

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A mucopolysaccharide or glycoprotein which is the chief constituent of mucus.

• m. clot test — the adding of acetic acid to normal synovial fluid, which causes clot formation. The compactness of the clot and the clarity of the supernatant fluid are the criteria on which the result is based.

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A mucopolysaccharide, the chief ingredient of mucus. Mucin is present in most glands that secrete mucus and is the lubricant that protects body surfaces from friction or erosion.

For a list of words related to mucin, see:

• Physiology - mucin: protein that forms mucus when mixed with water

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