The fruit of the shrub or small tree Amelanchier alnifolia (family Rosaceae), which is a small purple pome with a sweet, nutty flavour used as a source of food, originally by North American Indians. Also: the shrub itself, which is native to northwestern North America and has toothed, oval leaves and white flowers.
Also called Juneberry, service-berry.
Early 19th century. From saskatoon + berry.