Definition of butternut
English to English noun - North American walnut tree having light-brown wood and edible nuts; source of a light-brown dye
source: WordNet 3.0 - oily egg-shaped nut of an American tree of the walnut family
source: WordNet 3.0 - 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.
source: Webster 1913
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