||Ar*ro"ba (?), n. [Sp. and Pg., from Ar.
arrub, ar-rubu, a fourth part.] 1. A
Spanish weight used in Mexico and South America = 25.36 lbs. avoir.; also,
an old Portuguese weight, used in Brazil = 32.38 lbs. avoir.
2. A Spanish liquid measure for wine = 3.54 imp.
gallons, and for oil = 2.78 imp. gallons.