An alternate (mainly historical) spelling of casein, the main protein in milk.
From Latin 'caseus' (cheese) with French influence on spelling. This variant was used in 19th-century scientific literature before English standardized the spelling to 'casein'.
This spelling variant is a linguistic time capsule—if you read old chemistry books, you'll see 'caseine' everywhere, showing how international scientific terminology gradually converged on standard spellings.
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