but·ter·nut /-ˌnʌt/
  白胡桃的一種,白脫奶特
  But·ter·nut n.
  1. Bot. An American tree (Juglans cinerea) of the Walnut family, and its edible fruit; -- so called from the oil contained in the latter. Sometimes called oil nut and white walnut.
  2. Bot. The nut of the Caryocar butyrosum and Caryocar nuciferum, of S. America; -- called also Souari nut.
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  butternut
       n 1: North American walnut tree having light-brown wood and
            edible nuts; source of a light-brown dye [syn: butternut
            tree, white walnut, Juglans cinerea]
       2: oily egg-shaped nut of an American tree of the walnut family