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walnut

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noun

any of a genus (Juglans) of trees of the walnut family, valued as shade trees, for their nuts, and for their wood, used in making furniture, paneling, etc.
the edible nut of any of these trees, having a two-lobed seed
their wood
a shade of brown characteristic of the heartwood of the black walnut

adjective

designating a family (Juglandaceae, order Juglandales) of dicotyledonous trees native to the temperate parts of the Northern Hemisphere, including the black walnut, English walnut, pecan, and hickory

See walnut in American Heritage Dictionary 4