genus Prunus ge·nusp·ru·nus uncommon noun 1. a genus of shrubs and trees of the family Rosaceae that is widely distributed in temperate regions SynonymsPrunusgenus Prunus Related words Broader terms rosid dicot genus Parts Rosaceae Part of plumplumcotapricotcommon apricotpurple apricotcherryWestern sand cherrycherry laurel WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.