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Definition of butternut:

  1. 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. The nut of the Caryocar butyrosum and C. nuciferum, of S. America; - called also Souari nut.


Juglans cinerea, butternut tree, white walnut.

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