ˈrəs, ˈrüs noun
Etymology: New Latin, from Latin, sumac, from Greek rhous
1. capitalized : a genus of shrubs and trees (family Anacardiaceae) native to temperate and warm regions having simple or pinnate leaves and small polygamous flowers in panicles with persistent calyx and one-ovuled ovary that produces a small one-seeded drupe — see poison ivy , poison oak , staghorn sumac
2. pl rhuses or rhus : any plant of the genus Rhus