n. (Physiol. Chem.) A butyrate of glycerin; a fat contained in small quantity in milk, which helps to give to butter its peculiar flavor. [ 1913 Webster ]
n. [ F. burin, cf. It. burino, bulino; prob. from OHG. bora borer, borōn to bore, G. bohren. See 1st Bore. ]
n. One who works with the burin. For. Quart. Rev. [ 1913 Webster ]