Webster's English Dictionary

Enter the word to look up:

casein

ca.sein \ka--'se-n, 'ka--se--*n\ n [prob. fr. F case`ine, fr. L caseus] : a 
   phosphoprotein of milk : as  : one that is precipitated from milk by 
   heating with an acid or by lactic  acid in souring and that is used in 
   making paints and adhesives : one that is produced when milk is curdled by 
   rennet, that is one of the  chief constituents of cheese, and that is used 
   in making plastics