Etymology
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hickory (n.)

type of North American tree valued for its edible nuts and tough, flexible wood, 1670s, American English, from Algonquian (perhaps Powhatan), shortening of pockerchicory, pocohicora or a similar word, which is sometimes said to be the name for this species of walnut, but Bright calls it "a milky drink made from hickory nuts." Old Hickory as the nickname of U.S. politician Andrew Jackson is recorded from 1815.

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Definitions of hickory

hickory (n.)
valuable tough heavy hardwood from various hickory trees;
hickory (n.)
American hardwood tree bearing edible nuts;
Synonyms: hickory tree
From wordnet.princeton.edu