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The Collaborative International Dictionary
Oilnut

Oilnut \Oil"nut`\, n. (Bot.) The buffalo nut. See Buffalo nut, under Buffalo.

Note: The name is also applied to various nuts and seeds yielding oil, as the butternut, cocoanut, oil-palm nut.

Wiktionary
oilnut

n. 1 Any nut from which oil may be commercially extracted 2 The buffalo nut (nut of ''Pyrularia oleifera'')