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The Collaborative International Dictionary of English v.0.48 (gcide)

Pecan \Pe*can"\ (p[-e]*k[a^]n"), n. [Cf. F. pacane the nut.]
(Bot.)
A species of hickory ({Carya oliv[ae]formis}), growing in
North America, chiefly in the Mississippi valley and in
Texas, where it is one of the largest of forest trees; also,
its fruit, a smooth, oblong nut, an inch or an inch and a
half long, with a thin shell and well-flavored meat. [Written
also {pacane}.]
[1913 Webster]