BARRA, in commerce, a long-measure used in Portugal and some parts of Spain, to measure woolen cloths, linen cloths, and serges. There are three sorts; the barra of Valencia, 12 of which make 12½ yards English measure; the barra of Castile, 7 of which make 6½ yards; and the barra of Aragon, 3 of which make 2½ yards English.