Definition of casein in English:

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Pronunciation: /ˈkeɪsiːn/
Pronunciation: /ˈkeɪsɪɪn/


[mass noun]
The main protein present in milk and (in coagulated form) in cheese. It is used in processed foods and in adhesives, paints, and other industrial products.
Example sentences
  • The curd contains the main milk protein, casein, and the milk fat.
  • You will need to read all food labels as dairy turns up in many disguises, eg, whey, lactose, skimmed milk powder, casein, milk protein.
  • In addition, the enzymes that are naturally present in these bacteria begin breaking down the milk protein, casein.


Mid 19th century: from Latin caseus 'cheese' + -in1.

For editors and proofreaders

Line breaks: ca¦sein

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