Etymology
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rio (n.)

"a river," from Spanish rio, from Latin rivus "brook, stream" (from PIE root *rei- "to run, flow").

updated on May 14, 2017

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Definitions of rio from WordNet

Rio (n.)
the former capital and 2nd largest city of Brazil; chief Brazilian port; famous as a tourist attraction;
Synonyms: Rio de Janeiro
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.