Rocky Mountains cherry roc·ky·moun·tainscherry uncommon noun 1. dwarf ornamental shrub of western United States having large black to red and yellow sweet edible fruit SynonymsWestern sand cherryRocky Mountains cherryPrunus besseyi Related words Broader terms subshrub Parts Prunus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.