[pi-kahn, -kan, pee-kan]
a tall hickory tree, Carya illinoinensis, of the southern U.S. and Mexico, cultivated for its oval, smooth-shelled, edible nuts: the state tree of Texas.
a nut of this tree.

1765–75, Americanism; < Mississippi Valley French pacane < Illinois pakani < Proto-Algonquian *paka·n- nut (derivative of *pake·- crack nuts) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pecan (pɪˈkæn, ˈpiːkən)
1.  a hickory tree, Carya pecan (or C. illinoensis), of the southern US, having deeply furrowed bark and edible nuts
2.  the smooth oval nut of this tree, which has a sweet oily kernel
[C18: from Algonquian paccan; related to Ojibwa pagân nut with a hard shell, Cree pakan]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1712, paccan "the pecan tree," or a related hickory, from Fr. pacane, from an Algonquian word meaning "nut" (cf. Cree pakan "hard-shelled nut," Ojibwa bagaan, Abenaki pagann, Fox /paka:ni/).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
People didn't know that ice cream could be more exciting than butter pecan.
The campus is lined with native live oak and pecan trees as well as imported
  palm trees.
If you have a sweet tooth, don't miss the crispy pecan waffle, dressed with a
  pecan praline syrup.
Desserts range from autumn fruit crisp to brown butter pumpkin layer cake to
  chocolate pecan pie.
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