• 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.
any of the seeds borne in large, clustered fruits of trees of the genus Caryocar (family Caryocaraceae), which has about 15 species. C. nuciferum, ...
Sou·a'ri nut` (Botany) 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 .] 
[n] - a large nutlike seed of a South American tree
noun a large nutlike seed of a South American tree