But"ter*nut` (?), n.
1. Bot.
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.
The nut of the Caryocar butyrosum and C. nuciferum, of S. America; -- called also Souari nut.
© Webster 1913.