Source : Webster's Revised Unabridged Dictionary (1913)

Yern \Yern\, v. i.
   See 3d {Yearn}. [Obs.]

Yern \Yern\, a. [OE. [yogh]ern, [yogh]eorne, AS. georn desirous,
   eager. See {Yearn} to long.]
   Eager; brisk; quick; active. [Obs.] ``Her song . . . loud and
   yern.'' --Chaucer.