Source : Webster's Revised Unabridged Dictionary (1913)

Ern \Ern\, Erne \Erne\, n. [AS. earn eagle; akin to D. arend,
   OHG. aro, G. aar, Icel., Sw., & Dan. ["o]rn, Goth. ara, and
   to Gr. ? bird. ???. Cf. {Ornithology}.] (Zo["o]l.)
   A sea eagle, esp. the European white-tailed sea eagle
   ({Hali[ae]etus albicilla}).

Ern \Ern\, v. i. [Cf. {Erme}.]
   To stir with strong emotion; to grieve; to mourn.

   Note: [Corrupted into yearn in modern editions of
         Shakespeare.] [Obs.]

Source : WordNet®

ern
     n : bulky grayish-brown eagle with a short wedge-shaped white
         tail; of Europe and Greenland [syn: {erne}, {gray sea
         eagle}, {European sea eagle}, {white-tailed sea eagle}, {Haliatus
         albicilla}]