The Collaborative International Dictionary of English v.0.48:

Yern \Yern\, v. i.
   See 3d Yearn. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]