1911 Encyclopædia Britannica/Butter-Nut

BUTTER-NUT, the product of Caryocar nuciferum, a native of tropical South America. The large nuts, known also as saowari or suwarow nuts, are the hard stone of the fruit and contain an oily nutritious seed. The genus Caryocar contains ten species, in tropical South America, some of which form large trees affording a very durable wood, useful for shipbuilding.