redberry n 1: small spiny evergreen shrub of western United States and Mexico with minute flowers and bright red berries [syn: {red-berry}, {Rhamnus croceus}] 2: North American perennial herb with alternately compound leaves and racemes of small white flowers followed by bright red oval poisonous berries [syn: {red baneberry}, {red-berry}, {snakeberry}, {Actaea rubra}]