a hickory, Carya cordiformis, of the eastern and southern U.S., bearing a smooth, gray, bitter seed.

1800–10, Americanism; bitter + nut Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bitternut (ˈbɪtəˌnʌt)
1.  an E North American hickory tree, Carya cordiformis, with thin-shelled nuts and bitter kernels
2.  the nut of this plant

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Another hickory found here is this bitternut hickory.
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