n :  any of several phosphoproteins of milk: as  a  :  one that occurs as a colloidal suspension in milk - called also caseinogen   b  :  one that is produced when milk is curdled by rennet, is the chief constituent of cheese, and is used in making plastics - called also paracasein  .
 
   
 
Similar sounding terms:  quas·sin 
 
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