sou·a·ri nut 
(s-ärē)
(s-ärē)n.
1. A South American evergreen tree (Caryocar nuciferum) having opposite, trifoliolate leaves and drupes with nutlike stones containing seeds used as food and as a source of cooking oil.
2. The nut of this tree. In both senses also called butternut.
[French saouari, from Galibi sawarra.]