WordReference Random House Unabridged Dictionary of American English © 2020
mu•cin  (myo̅o̅sin),USA pronunciation n. [Biochem.]
  1. Physiology, Biochemistryany 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.
mucin•oid′, adj. 
mu•ci•nous  (myo̅o̅sin),USA pronunciation adj. 
  • 1825–35; muc- + -in2

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