Also called white walnut. the edible oily nut of an American tree, Juglans cinerea, of the walnut family.
the tree itself.
the light-brown wood of this tree, used for making furniture.
the light-brown color resulting from a dye made from this tree.
U.S. History. a Confederate soldier or partisan, especially one whose uniform was dyed with an extract from this tree.

1735–45, Americanism; so called from the nut's oiliness

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World English Dictionary
butternut (ˈbʌtəˌnʌt)
1.  Compare black walnut a walnut tree, Juglans cinerea of E North America
2.  the oily edible egg-shaped nut of this tree
3.  the hard brownish-grey wood of this tree
4.  the bark of this tree or an extract from it, formerly used as a laxative
5.  a brownish colour or dye
6.  (NZ) short for butternut pumpkin

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1753, nut of the white walnut, a N.Amer. tree; transferred to the tree itself from 1783. The nut's color was a brownish-gray, hence the word was used (1861) to describe the warm gray color of the Southern army uniforms in the Amer. Civil War.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We had a spice-rubbed pork, roasted butternut bisque, and some green beans.
Add zucchini and butternut squash to broth and return to a simmer.
My favorite would be pumpkin ravioli with butternut squash with a butter and
  sage squash.
For a light meal, order the raw butternut squash made with coconut and topped
  with crispy chickpeas.
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