ba·bas·su (bä'bə-sōō') n. A Brazilian feather-leaved palm (Orbignya phalerata) bearing hard-shelled fruits whose seeds yield an oil that is used in food and skin-care products and as a biofuel.
[Portuguese babaçú, from Tupi babassú, ibabassú : ibá, fruit + -bassú, variant of -assú, -guassú, big.]