Definition of: peso

(pā′sō) noun plural ·sos
1. A monetary unit of Cuba, the Philippines, Mexico, and certain other Latin–American countries, equal to 100 centavos.
2. An old Spanish coin equal to 8 reales; the Spanish dollar or piece–of–eight. [<Sp., orig. a weight <L pensum, orig. pp. neut. of pendere weigh]