Sou·a·ri nut Bot. The large edible nutlike seed of a tall tropical American tree (Caryocar nuciferum) of the same natural order with the tea plant; -- also called butternut. [Written also sawarra nut.]

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 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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 souari nut
      n 1: large South American evergreen tree trifoliate leaves and
           drupes with nutlike seeds used as food and a source of
           cooking oil [syn: souari, souari tree, {Caryocar
           nuciferum]
      2: a large nutlike seed of a South American tree