butternut

But"ter*nut`, n. 1. (Bot.) Defn: An American tree (Juglans cinerea) of the Walnut family, and its edible fruit; -- so called from the oil contained in the latter. Sometimes called oil nut and white walnut. 2. (Bot.) Defn: The nut of the Caryocar butyrosum and C. nuciferum, of S. America; -- called also Souari nut.

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