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—a device for fastening or ornamenting articles of apparel, usually round, and designated in the trade according to composition, shape, style, purpose, etc., as silk braid b., mohair b., lasting b., cloth b., hard rim b., ivory b., rubber b., composition b., bone b., pearl b., horn b., gilt b., etc.; flat b., cup b., ¼ round b., ½ round b., shank b., 2 hole b., 4 hole b., uniform b., pants b., vest b., coat b., overcoat b., etc.; all of which see.