milkstone

noun

Definition of milkstone 

1a : a stone (as galactite) believed to increase milk secretion

b : any of various white stones (as a flint pebble)

2 : a hard body that forms in the bovine udder

3 : a hard deposit of milk residues that accumulates on imperfectly cleansed dairy utensils and serves as a substrate for bacteria and contributes off-flavors to milk

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