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. ] 1. The cutting tool of an engraver on metal, used in line engraving. It is made of tempered steel, one end being ground off obliquely so as to produce a sharp point, and the other end inserted in a handle; a graver; also, the similarly shaped tool used by workers in marble. [ 1913 Webster ]
2. The manner or style of execution of an engraver; as, a soft burin; a brilliant burin. [ 1913 Webster ]
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