Bŭt'ter-nŭt, n.

n. 1. (Bot.) An American tree (the Juglans cinerea) and its fruit, so called from the oil contained in the latter; — sometimes called oil-nut and white walnut. 2. The nut of the Caryocar butyraceum and C. nuciferum, a native of South America, called also the Sawari nut.