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Rioy (REE-oh-ee) A harsh, medicinal quality, the term derives from a reference to low quality coffees from Brazil (i.e., Rio De Janeiro).
In General
Over sixty-five percent of the coffee grown throughout the world is arabica, but much of it is unexceptional. On its own, the label "arabica" is no assurance of quality: you will need to know much more about it and find a reputable retailer who can provide much more information, and who has sampled ("cupped") each lot. As noted, although Brazil grows some excellent coffee, a sizeable portion of the arabica grown there is of quite poor quality, to the point where the coffee trade uses a particular term, "Rioy" (from Rio de Janeiro), to describe certain particularly harsh, pungent coffees.
Fonte: http://www.thecoffeefaq.com/