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.
- An eastern North American walnut (Juglans cinerea) having light-brown wood, pinnately compound leaves, and a deeply furrowed nut enclosed in an egg-shaped, sticky, aromatic husk. Also called white walnut.
- The nut of this tree, having an edible sweet kernel.
- The wood of this tree, used for furniture, boxes, and interior finishes.
- The bark of this tree.
- A brownish dye obtained from the husks of the fruits of this tree.
- Clothing dyed with butternut extract, especially the uniforms of Confederate soldiers in the Civil War.
- Informal A Confederate soldier or partisan in the Civil War.
- See souari nut.