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The Collaborative International Dictionary
oil nut

Butternut \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.

WordNet
oil nut

n. oily drupaceous fruit of rabbitwood [syn: buffalo nut, elk nut]