Source : Webster's Revised Unabridged Dictionary (1913)

Yernut \Yer"nut`\, n. [Cf. Dan. jordn["o]d, Sw. jordn["o]t,
   earthnut. Cf. {Jarnut}.]
   An earthnut, or groundnut. See {Groundnut}
   (d) . [Written also {yarnut}.]