Pronunciation: (u-rō'bu; Sp. and Port. är-rô'bä),[key] —n., —pl.-basPronunciation: (-buz; Sp. and Port. -bäs).[key] 1. a Spanish and Portuguese unit of weight of varying value, equal to 25.37 pounds avoirdupois (9.5 kilograms) in Mexico and to 32.38 pounds avoirdupois (12 kilograms) in Brazil.
2. a unit of liquid measure of varying value, used esp. in Spain and commonly equal (when used for wine) to 4.26 U.S. gallons (16.1 liters).