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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 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.
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From: WordNet (r) 2.0

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