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Arroba
Arroba 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.
Meaning of Arroba from wikipedia