Definition of: butternut

(but′ər·nut′) noun
1. The oily, edible nut of the North American white walnut (Juglans cinerea).
2. The tree, or its cathartic inner bark.
3. An oily, nutlike seed of a tall tree (Caryocar nuciferum), native in British Guiana, having a hard, brown, tubercled shell: also called souari nut.
4. The dye obtained from the bark and roots of the butternut tree.
5. A Confederate soldier; also, a Southern sympathizer in the Civil War.
6. Cloth or a garment dyed with butternut.