pe·can /pɪˈkɑn, ˈkæn; ˈpiˌkæn/
  一種大胡桃
  Pe·can n.  Bot. A species of hickory (Carya olivæformis), 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.]
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  pecan
       n 1: wood of a pecan tree
       2: tree of southern United States and Mexico cultivated for its
          nuts [syn: pecan tree, Carya illinoensis, Carya
          illinoinsis]
       3: smooth brown oval nut of south central United States