Etymology
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casein (n.)

principal protein-constituent of milk, forming the basis of cheese, 1841, from French caséine, from Latin caseus "cheese" (see cheese (n.1)) + chemical suffix -ine (2).

updated on January 28, 2013

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Definitions of casein from WordNet

casein (n.)
a milk protein used in making e.g. plastics and adhesives;
casein (n.)
a water-base paint made with a protein precipitated from milk;
Synonyms: casein paint
From wordnet.princeton.edu, not affiliated with etymonline.