Rio rintherout • rio · · · Info · Definitions · Characters · · Rio · · Text Latin · · Script 3 · · Length Definitions · · · (noun) the former capital and 2nd largest city of Brazil; chief Brazilian port; famous as a tourist attraction. Synonyms: Rio de Janeiro. · · Noun Definition 1 Characters · · R latin capital letter r U+0052 i latin small letter i U+0069 o latin small letter o U+006F