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usually uncountable, plural robustas
A plant of the African coffee plant species Coffea canephora. examples
Beans, ground roasted beans, or beverage from the robusta coffee bean, used primarily in instant coffee and as a filler in blends. quotations examples
Prices of robusta coffee (the lower-quality bean commonly used in instant coffees) rose by 20% in three days last week to their highest in more than a year.
2010 June 14, David Teather, “Coffee prices rise 20% in a week”, in The Guardian